WO2023029475A1 - Model perspective method, intelligent terminal and storage device - Google Patents

Abstract

The present invention provides a model perspective method, an intelligent terminal, and a storage device. The model perspective method comprises: S101: acquiring perspective selection information, and calculating a current penetration surface according to the perspective selection information, the perspective selection information comprising mouse coordinates and a view direction; and S102: determining perspective information according to the current penetration surface, continuously obtaining a depth value of a user, and performing model perspective and recovery according to the depth value of the user, the depth value of the current surface, and the perspective information, the perspective information comprising a candidate entity list and a cull list. The present invention does not need to manually hide and restore the display operation to the model, and is simple to operate, short in time consumption and capable of improving the interaction experience of the user.

Description

Model perspective method, intelligent terminal and storage device technical field

The invention relates to the field of model display, in particular to a model perspective method, an intelligent terminal and a storage device.

Background technique

In the CAD product model, there will be many part models that occlude or contain each other, and a single model also has mutual occlusion of different entities. When displaying these models, the terminal will use the occlusion relationship between different parts or entities in the model Select the unoccluded part to display.

However, when viewing or manipulating a model, the user often needs to select an occluded part of the model for display. In order to achieve this goal, it is necessary to manually select the front occluded components or entities one by one to hide until there is no component or entity that can be occluded in front of the occluded object. Moreover, when the user needs to view the hidden objects, it is necessary to manually restore and display the hidden objects one by one. The operation is cumbersome and time-consuming, which reduces the work efficiency and interactive experience.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention proposes a model perspective method, an intelligent terminal and a storage device, calculates the current penetration surface according to the mouse coordinates and the view direction, obtains the list of candidate entities, the list of eliminated surfaces, and according to the obtained user depth value and current depth value to obtain the currently hidden and displayed surfaces for perspective and restoration of the model. There is no need to manually hide and restore the display of the model. The operation is simple and time-consuming, which improves the user's interactive experience.

In order to solve the above problems, a technical solution adopted by the present invention is: a model perspective method, the model perspective method includes: S101: Acquire perspective selection information, calculate the current penetration surface according to the perspective selection information, and the perspective selection The information includes mouse coordinates and view directions; S102: Determine perspective information according to the current penetration surface, continuously acquire user depth values, perform perspective and restoration of the model according to the user depth values, current depth values, and perspective information, and The above-mentioned perspective information includes a list of candidate entities and a list of eliminated faces.

Further, before the step of acquiring perspective selection information, it may further include: judging whether a perspective instruction is received; if yes, perform S101; if not, do not perform S101.

Further, the step of calculating the current penetration surface according to the perspective selection information specifically includes: obtaining the world coordinates of the selected point in the world coordinate system and the world view direction through the mouse coordinates and the view direction, and using the world coordinates and world view direction to generate rays, and obtain the current penetration surface according to the rays.

Further, the step of determining the perspective information according to the current penetration surface specifically includes: performing line-plane intersection on the ray and the current penetration surface to obtain the intersection point of the ray and the current penetration surface Coordinates: Obtain the depth value of the intersection point according to the coordinates of the intersection point and the world view direction, and generate a candidate entity list and a list of eliminated surfaces based on the depth value.

Further, the step of generating a list of candidate entities and a list of eliminated surfaces based on the depth values specifically includes: sorting the current penetration surfaces according to the depth values of intersection points on the current penetration surface, and generating candidate entities based on the sorting list, and put the faces in the model that are culled and intersected by the ray into the culled faces list.

Further, the step of continuously acquiring the user depth value specifically includes: continuously detecting depth input information, and determining the user depth value according to the depth input information, current coordinate depth, and perspective information.

Further, the step of performing perspective and restoration of the model according to the user depth value, the current depth value and perspective information specifically includes: judging whether the user depth value is smaller than the current depth value; The elimination surface whose depth value is greater than the current one in the list of eliminated surfaces is determined to be in a non-perspective state, modify the perspective information according to the non-perspective state, and draw the model based on the modified perspective information; if not, then in When the user depth value is greater than the current depth value, determine the surface whose depth value is smaller than the user depth value in the candidate entity list as a perspective state, modify the perspective information according to the perspective state, and based on The modified perspective information draws the model.

Further, after the step of performing perspective and restoration of the model according to the user depth value, the current depth value and perspective information, it further includes: judging whether perspective object change information is detected, and the perspective object change information includes model rotation 1. At least one of mouse movement; if yes, execute S101; if no, display the model according to the user's depth value.

Based on the same inventive concept, the present invention also proposes an intelligent terminal, which includes a processor and a memory, the memory stores a computer program, and the processor executes the above-mentioned model perspective method according to the computer program .

Based on the same inventive idea, the present invention also proposes a storage device, the storage device stores program data, and the program data is used to execute the above-mentioned model perspective method.

Compared with the prior art, the present invention has the beneficial effects of calculating the current penetrating surface according to the mouse coordinates and the view direction, obtaining the list of candidate entities and the list of eliminated surfaces, and obtaining the currently hidden The surface and the displayed surface can be used for perspective and recovery of the model, without the need to manually hide and restore the display of the model, the operation is simple and time-consuming, and the user's interactive experience is improved.

Description of drawings

Fig. 1 is the flowchart of an embodiment of the model perspective method of the present invention;

FIG. 2 is a functional architecture diagram of an embodiment of the terminal of the application model perspective method of the present invention;

Fig. 3 is a flowchart of another embodiment of the model perspective method of the present invention;

Fig. 4 is a flowchart of another embodiment of the model perspective method of the present invention;

FIG. 5 is a structural diagram of an embodiment of an intelligent terminal of the present invention;

FIG. 6 is a structural diagram of an embodiment of the storage device of the present invention.

Detailed ways

Below, the present invention will be further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of not conflicting, the various embodiments described below or the technical features can be combined arbitrarily to form new embodiments. .

Please refer to FIGS. 1-4. FIG. 1 is a flow chart of an embodiment of the model perspective method of the present invention; FIG. The flowchart of the embodiment; FIG. 4 is a flowchart of another embodiment of the model perspective method of the present invention, and the model perspective method of the present invention will be described in detail in conjunction with FIGS. 1-4.

In this embodiment, the smart terminal applying the model perspective method can be a mobile phone, a notebook computer, a desktop computer, an all-in-one computer, a tablet computer, a server, a cloud platform, and other devices capable of displaying a model and editing the model according to received instructions.

In this embodiment, the functional modules used by the smart terminal to execute the model perspective method include a response module, a display module, a selection module, a perspective technology module and a data module, wherein the response module is located at the presentation layer, and the display module, the selection module, and the perspective technology module The module is located in the business layer, and the data module is located in the data layer. The processor in the smart terminal runs the above functional modules according to the computer program in the memory to realize the model perspective method.

Among them, the response module includes the input and output of the intelligent terminal, including the display and the mouse. The input obtained by the response module is mouse coordinate information, mouse wheel information and view direction information, and the output is screen display information. The display module is used for model display, so as to realize the perspective function. The display module applies OpenGL technology. The occlusion display of the 3D entity in CAD is realized through the depth test of OpenGL. OpenGL stores all the depth information in a Z buffer (Z-buffer), also known as the depth buffer (Depth Buffer). ). The OpenGL application framework GLFW automatically generates the Z buffer. The depth value of each pixel in the model is stored in each fragment of the Z buffer. When the fragment wants to output the color of the pixel, OpenGL will compare the depth value of the pixel with the z buffer. If the current fragment is behind other fragments, It will be discarded, otherwise it will be overwritten. This process is called depth testing (Depth Testing), it is done automatically by OpenGL.

The selection module is mainly used for model selection, so as to realize the function of surface selection in perspective. The selection function mainly uses technologies such as "ray method and surface strategy sorting" to sort entities in depth. By constructing candidate entities, entities of different depths can be selected.

The perspective technology module stores some calculation methods and data maintenance methods in the perspective function, mainly including depth rules and elimination rules. The depth rule refers to the calculation method of the user depth value, which determines the ease of use of the function, the user depth value D _user and the scroll value m of the mouse wheel, the current number of candidate faces n _can , and the current elimination The number of faces n _del is related to the current depth value D _pre , that is

D _user = f(m, n _can , n _del , D _pre ). Elimination rules refer to the criteria for judging and maintaining the data of eliminated surfaces during the perspective process. For the perspective function, it is necessary to consider the restoration of the perspective surface, so the data of the eliminated surfaces needs to be saved. The perspective technology module maintains a list of eliminated faces, corresponding to the list of candidate entities in the selection module (the list of candidate entities saves the data of all faces penetrated by the ray method, and is sorted by depth value). Note that the intersection of the culled face list and the candidate entity list is empty. The two lists are updated in real time according to the perspective and reply of the model, and the selection module is used to realize the selection and removal of faces.

The data module is mainly used to save the data information in each module.

When the smart terminal turns on the see-through function, it automatically obtains the response input of the device, mainly including mouse coordinates, view direction and mouse wheel value. According to the information input in response, the smart terminal can construct the corresponding data, mainly including the list of candidate entities, the list of eliminated faces and the user depth value. After obtaining the data, the smart terminal calls the display module and the selection module again to realize the perspective or recovery function of the current model. When the mouse moves or rotates the view, the smart terminal dynamically obtains new response input and repeats the above process. Through coordinate transformation and view rotation, quickly select the surface that needs to be perspectived and displayed, and the use of model perspective method can be more convenient and flexible, which greatly improves the efficiency of designers.

In this embodiment, the model perspective method includes:

S101: Obtain perspective selection information, and calculate a current penetration surface according to the perspective selection information, where the perspective selection information includes mouse coordinates and view directions.

The smart terminal obtains the mouse coordinates and view direction, and calculates the current penetration surface of the model that may be perspectived according to the mouse coordinates and view direction. Use the current penetration surface to provide reference information for the perspective and restoration of the subsequent model. Obtain the currently selected surface and the 3D coordinates of the selected point on the model through the mouse coordinates.

In this embodiment, before the step of acquiring the perspective selection information, it further includes: judging whether a perspective instruction is received; if yes, execute S101; if not, do not execute S101.

Wherein, when the smart terminal obtains the perspective selection information, it also automatically collects the user's mouse wheel value.

In a specific embodiment, after the smart terminal determines to receive an instruction to enable the see-through function, it starts the see-through function, and automatically acquires the user's see-through selection information and the value of the mouse wheel.

The steps of calculating the current penetration surface according to the perspective selection information include: obtaining the world coordinates of the selected point in the world coordinate system and the world view direction through the mouse coordinates and the view direction, and using the world coordinates and the world view direction to generate rays, and obtaining them according to the rays The current penetration face.

计算当前屏幕坐标点在世界坐标系中的世界坐标p ₁和视图方向

对应的世界视图方向

In this embodiment, the mouse coordinates are the current screen coordinates of the mouse on the screen, through the current screen coordinates p ₀ and the view direction

Calculate the world coordinate p ₁ and view direction of the current screen coordinate point in the world coordinate system

Corresponding world view direction

In a specific embodiment, after obtaining the world coordinates and the world view direction, use the ray method to calculate the current penetration surface, construct the ray with the world coordinates and the world view direction, and make the ray penetrate the current model to obtain the The current penetrating surface of the penetrating surface.

S102: Determine the perspective information according to the current penetration surface, continuously obtain the user depth value, and perform perspective and restoration of the model according to the user depth value, current depth value and perspective information. The perspective information includes a list of candidate entities and a list of eliminated surfaces.

In this embodiment, the step of determining the perspective information according to the current penetration surface specifically includes: performing a line-plane intersection on the ray and the current penetration surface to obtain the coordinates of the intersection point of the ray and the current penetration surface; according to the coordinates of the intersection point, the world view The direction obtains the depth value of the intersection point, and generates a list of candidate entities and a list of culled faces based on the depth value.

Among them, the step of generating the list of candidate entities and the list of eliminated surfaces based on the depth value specifically includes: sorting the current penetration surface according to the depth values of the intersection points on the current penetration surface, generating the list of candidate entities based on the sorting, and setting the model in the elimination state And the faces intersected by the ray are placed in the list of culled faces.

In a specific embodiment, the coordinates of the intersection point in the world coordinate system are (p _x , p _y , p _z ), the world view direction is (v _x , v _y , v _z ), and the depth of the intersection point D=p _x *v _x +p _y *v _y +p _z *v _z . Among them, p _x , p _y , p _z are the coordinates of the intersection point on the X, Y, and Z axes of the world coordinate system respectively, and v _x , v _y , v _z are the X, Y, and Z axes of the world view direction in the world coordinate system Vector on the axis, the depth value of the intersection point is D. Sort the current penetration surface according to the depth value of the intersection point. Among them, the entities that are eliminated in the current penetration surface and are perspectived are added to the list of eliminated surfaces, and the surfaces that are not perspectived are added to the list of candidate entities.

The step of continuously obtaining the user's depth value specifically includes: continuously detecting the depth input information, and determining the user's depth value according to the depth input information, current coordinate depth, and perspective information.

In this embodiment, the depth input information is the scrolling value of the mouse wheel. In other embodiments, the depth input information may also be numbers, characters, special characters and other information that can be identified and based on which the user's depth value can be obtained.

In a specific embodiment, the smart terminal detects the scrolling event of the mouse wheel. After obtaining the scrolling event of the mouse wheel, according to the scrolling value of the mouse wheel and the current number of candidate entities, the current number of eliminated faces and the current mouse coordinates Depth calculation of the user depth value, wherein, through D _user = f (m, n _can , n _del , D _pre ) to calculate, the user depth value is D _user , the scroll value of the mouse wheel is m, and the number of current candidate faces is n _can , the current number of eliminated faces is n _del , and the current depth value is D _pre . Convert the scroll value to the depth value in the current view direction, which is the user depth value.

In this embodiment, the step of perspective and restoration of the model according to the user depth value, current depth value and perspective information specifically includes: judging whether the user depth value is smaller than the current depth value; If the depth value is greater than the current culling surface, it is determined to be in a non-perspective state, modify the perspective information according to the non-perspective state, and draw the model based on the modified perspective information; if not, when the user's depth value is greater than the current depth value, the candidate will be selected The surface whose depth value in the entity list is smaller than the user's depth value is determined as the perspective state, and the perspective information is modified according to the perspective state, and the model is drawn based on the modified perspective information. Among them, the current face is the face selected by the current user, that is, the face where the mouse coordinates are located.

In a specific embodiment, the smart terminal compares the user's depth value with the depth value of the candidate face in the candidate entity list, and when the user's depth value is greater than the current face's depth value, that is, the current face should be seen through. For the faces that should be perspective, hide the faces that should be perspective by redrawing the display of the current model, and then delete the faces that should be perspective by updating the list of candidate entities, and save them in the list of eliminated faces. At this time, the perspective surface is not visible on the screen and cannot be selected for operation. At this point, operations such as selecting surfaces displayed on the smart terminal and executing modeling commands can be performed.

In another specific embodiment, when the user's depth value is smaller than the current depth value, it is compared with the depth value of the nearest culled face in the culled face list. When the user depth value is greater than the depth of the nearest culled face, it is considered that the culled face has returned to the non-perspective state. Similarly, redraw the current model to display the culled surface with the largest depth value among the culled surfaces whose depth value is less than or equal to the user's depth value, and update the candidate list and the culled surface list synchronously. At this point, we can select the current display surface, execute modeling commands and other operations.

In this embodiment, after the step of perspective and restoration of the model according to the user's depth value, current depth value and perspective information, it further includes: judging whether perspective object change information is detected, perspective object change information includes model rotation, mouse movement at least one of them; if yes, execute S101; if not, display the model according to the user depth value.

In other embodiments, the change information of the perspective object may also be a model editing operation input by the user, such as replacing, hiding, dragging, etc., which can change the coordinates of the mouse.

Beneficial effects: the model perspective method of the present invention calculates the current penetration surface according to the mouse coordinates and the view direction, obtains the list of candidate entities and the list of eliminated surfaces, and obtains the currently hidden surface and the displayed surface according to the obtained user depth value and the current depth value. The perspective and recovery of the model can be carried out without manual operations of hiding and restoring the display of the model. The operation is simple and time-consuming, which improves the user's interactive experience.

Based on the same inventive concept, the present invention also proposes an intelligent terminal, please refer to FIG. 5 , which is a structural diagram of an embodiment of the intelligent terminal of the present invention. The smart terminal of the present invention will be described with reference to FIG. 5 .

In this embodiment, the smart terminal includes a processor and a memory, the memory stores a computer program, and the processor executes the model perspective method as described in the above embodiments according to the computer program.

Based on the same inventive concept, the present invention also proposes a storage device. Please refer to FIG. 6 , which is a structural diagram of an embodiment of the storage device of the present invention. The storage device of the present invention will be described in conjunction with FIG. 6 .

In this embodiment, the storage device stores program data, and the program data is used to execute the model perspective method described in the above embodiments.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

A model perspective method, characterized in that the model perspective method comprises: S101: Obtain perspective selection information, and calculate a current penetration surface according to the perspective selection information, where the perspective selection information includes mouse coordinates and view directions; S102: Determine the perspective information according to the current penetration surface, continuously acquire the user depth value, perform perspective and restoration of the model according to the user depth value, current depth value and perspective information, the perspective information includes a list of candidate entities, List of culled faces. The model perspective method according to claim 1, further comprising: before the step of acquiring perspective selection information: Judging whether a perspective instruction is received; If yes, execute S101; If not, S101 is not executed. The model perspective method according to claim 1, wherein the step of calculating the current penetration surface according to the perspective selection information specifically comprises: The world coordinates and the world view direction of the selected point in the world coordinate system are obtained through the mouse coordinates and the view direction, and a ray is generated by using the world coordinates and the world view direction, and the current penetration surface is obtained according to the ray. The model perspective method according to claim 3, wherein the step of determining perspective information according to the current penetration surface specifically comprises: performing a line-plane intersection between the ray and the current penetration surface to obtain the coordinates of the intersection of the ray and the current penetration surface; Obtain the depth value of the intersection point according to the coordinates of the intersection point and the world view direction, and generate a candidate entity list and a list of eliminated surfaces based on the depth value. The model perspective method according to claim 4, wherein the step of generating a list of candidate entities and a list of eliminated faces based on the depth value specifically comprises: Sort the current penetration surface according to the depth value of the intersection point on the current penetration surface, generate a candidate entity list based on the sorting, and put the surface in the model that is in the culling state and intersects with the ray into the culling surface list. The model perspective method according to claim 3, wherein the step of continuously acquiring user depth values specifically comprises: The depth input information is continuously detected, and the user depth value is determined according to the depth input information, current coordinate depth, and perspective information. The model perspective method according to claim 6, wherein the step of perspective and recovery of the model according to the user depth value, the current depth value and perspective information specifically comprises: judging whether the user depth value is smaller than the current depth value; If yes, then determining the culling surface whose depth value is greater than the current surface in the culling surface list as a non-perspective state, modifying the perspective information according to the non-perspective state, and drawing the model based on the modified perspective information; If not, when the user depth value is greater than the current depth value, determine the surface whose depth value is smaller than the user depth value in the candidate entity list as a perspective state, and modify the Perspective information, and drawing the model based on the modified perspective information. The model perspective method according to claim 1, characterized in that, after the step of performing perspective and restoration of the model according to the user depth value, the current depth value and perspective information, it also includes: Judging whether perspective object change information is detected, the perspective object change information includes at least one of model rotation and mouse movement; If yes, execute S101; If not, the model is displayed according to the user's depth value. An intelligent terminal, characterized in that the intelligent terminal includes a processor and a memory, the memory stores a computer program, and the processor executes the model according to any one of claims 1-8 according to the computer program perspective method. A storage device, characterized in that the storage device stores program data, and the program data is used to execute the model perspective method according to any one of claims 1-8.

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