65 results about "Shadow mapping" patented technology

Virtualization software establishes multiple execution environments within a virtual machine, wherein software modules executing in one environment cannot access private memory of another environment. A separate set of shadow memory address mappings is maintained for each execution environment. For example, a separate shadow page table may be maintained for each execution environment. The virtualization software ensures that the shadow address mappings for one execution environment do not map to the physical memory pages that contain the private code or data of another execution environment. When execution switches from one execution environment to another, the virtualization software activates the shadow address mappings for the new execution environment. A similar approach, using separate mappings, may also be used to prevent software modules in one execution environment from accessing the private disk space or other secondary storage of another execution environment.

The invention discloses a shadow rendering method and device, a terminal and a storage medium, and belongs to the technical field of image rendering. The method comprises the steps of obtaining at least one rendering structural body in a virtual scene according to an illumination direction in the virtual scene; obtaining model coordinates of the plurality of pixel points according to the current visual angle and the depth information of the plurality of pixel points; sampling at least one shadow map according to the model coordinates of the plurality of pixel points to obtain a plurality of sampling points corresponding to the plurality of pixel points; and rendering the plurality of sampling points in the virtual scene to obtain the at least one shadow. Under the condition that a third-party plug-in is not used, real-time rendering of the shadow is achieved based on the function of the rendering engine, memory resources of the terminal are saved, and the processing efficiency of a CPUof the terminal is improved.

A method for implementing a graphics pipeline. The method includes building a first shadow map of high resolution, and building a second shadow map based on the first shadow map of lower resolution. The method includes determining a light source affecting a virtual scene, and projecting geometries of objects of an image of the virtual scene onto a plurality of pixels of a display from a first point-of-view. The method includes determining a foveal region when rendering the image, wherein the foveal region corresponds to where an attention of a user is directed. The method includes determining a first set of geometries is drawn to a first pixel, determining the first set of geometries is in shadow based on the light source, and determining the first set of geometries is outside of the foveal region. The method includes rendering the first set of geometries using the second shadow map.

The invention discloses an image processing method for scene drawing. The method comprises the following steps of: constructing complex scene data, drawing a shadow map of the scene, and drawing the scene in a viewpoint vision cone. According to the method, a tiny object is represented by a semitransparent line segment, and the drawing effect retains rich detailed information; according to the manner of drawing for multiple times, the problem of data in small batch is avoided, and the drawing efficiency is improved; via model combination, single-stage level of detail (LOD) model output of a geometrical shader and model position point sequencing, columnar geometries with different thicknesses can be represented by line segment models with different transparency, thereby ensuring the accuracy of Alpha mixing, realizing semitransparent drawing, and keeping more details.

The invention discloses a method, a device and a terminal for displaying shadow in games, wherein the method comprises the following steps: acquiring shadow mapping in a game scene as well as positional information of a virtual object in the game scene, wherein the positional information comprises position of each vertex on a three-dimensional model constituting the virtual object; implementing sampling on the shadow mapping in accordance with the positional information, so that shadow information is obtained, and obtaining shadow color value in accordance with the shadow information, whereinthe shadow information includes sampling information, corresponding to the location of each vertex, on the shadow mapping; rendering the virtual object in accordance with the shadow color value; and displaying the rendered virtual object. According to the invention, the technical problem of the prior art that models, which transit on a bright-dark junction site in a game scene, are poor in lighting display effect can be solved.

An image processing apparatus is provided. The image processing apparatus may include a first calculator to generate a first shadow map with respect to a static object included in a three-dimensional (3D) model, at a first viewpoint within the 3D model, a second calculator to generate a second shadow map with respect to a dynamic object included in the 3D model, at the first viewpoint, and a third calculator to generate a third shadow map with respect to the 3D model at the first viewpoint by synthesizing the first shadow map and the second shadow map. The image processing apparatus may decrease an amount of calculation necessary when performing three-dimensional (3D) rendering for a plurality of frames.

The invention discloses a real-time soft shadow realization method based on an image screen space. The method comprises the following steps that: A, all objects in a visible range of a virtual camera in a scene are traversed; B, a light source space is built, a vein used for storing the depth in a screen space is created, and a shadow map is generated; C, a world position coordinate is converted into a lamp light space through projection conversion, and a depth map of new positions of pixels is obtained; D, the depth of the new positions of the pixels is compared with the shadow map to judge which pixels are positioned in the shadow, so that a shadow mask is obtained; E, the shadow mask is subjected to Gaussian blur processing; and F, the shadow mark subjected to the Gaussian blur processing is overlaid with the scene color, and a soft shadow effect is achieved. The real-time soft shadow realization method has the advantages that the traditional PCF (Percentage Closer Filtering) based on sampling veins is improved; the problem of the phenomenon of saw tooth generation on the boundary of a scene model is effectively solved; a better soft shadow effect is achieved; in addition, the effect of realizing the soft shadow effect on complicated scenes is also very good; and the drawing efficiency is high.

The invention relates to a computer application technology and the field of computer vision, and particularly relates to a three-dimensional vector model real-time light and shadow deferred shading method based on controllable texture baking. The method comprises the following steps: loading a whole large-scale complex model scene into a 3Dmax; calculating a visibility function of each pixel of the whole scene in terms of time, simplifying the visibility functions and then storing the simplified visibility functions into two colourful texture groups; calculating the average illumination of the time period in time domain; generating a faint shadow by utilizing shadows shaded by light source points on the time period; calculating light sources in the shadow information by virtue of a PCF (Photonic Crystal Fiber) method so as to obtain characteristics such as final visibility value. An offline shading method based on ray tracing and adjacent region sampling filtration blocking interval mapping technology are combined, the shadow generated according to the algorithm is more real, the sawtooth problem generated by a shadow mapping algorithm is overcome, and the application requirement of virtual reality is met.

The invention discloses a picture rendering method and device, a storage medium and an electronic device. The method comprises the following steps of acquiring model data of a target object in a target scene, wherein the model data is used for representing a model of the target object displayed in the target scene; converting the model data into shape data corresponding to a target object, whereinthe shape data is used to represent the geometry of the model; generating the shadow map of the model in the target scene according to the shape data, wherein the shadow map is used for carrying theshadow formed by the model in the target scene; according to the model data and shadow map, rendering the target scene corresponding to the screen. The invention solves the technical problem in the related art that the overhead of rendering shadows in a picture is too large to affect the display efficiency of the picture.

The invention discloses a method for shadow rendering in virtual home decoration indoor scene design. The method comprises the steps of shadow mapping graph generation, half shadow estimation, percentage approximation filtering based on Poisson disc sampling and finally generation of a virtual home decoration indoor scene shadow effect graph with the reality sense through adding of diffusion reflection environment light. The method can effectively solve the problem of sawtooth deformation of a shadow mapping graph.

The invention discloses an image rendering method and a related device. The method comprises the steps of obtaining a low-resolution first shadow map and a high-resolution second shadow map of a target virtual object; determining a first texel range and a central point of each texel in the first shadow map; and performing scaling processing on the first texel range by using a scaling coefficient based on the central point to obtain a second texel range, and rendering the second texel range into a second shadow map to perform shadow rendering on the target virtual object. Therefore, the image rendering process based on the shadow map is realized, and the calculation amount of determining the map position through the low-resolution map is relatively small, so that the image rendering efficiency is improved; and then, the high-resolution shadow map is rendered, so that edge sawteeth are avoided, and the image rendering effect is improved.

The embodiment of the present invention discloses a three-dimensional model processing method, including: acquiring the three-dimensional model and the material of the three-dimensional model; setting the material parameters of the three-dimensional model according to the material of the three-dimensional model; and generating A shadow map of the 3D model; generating an ambient light shading effect of the 3D model according to the material parameters; baking the shadow map and the ambient light shading effect to the 3D model to generate a 3D model with light and shadow effects Model. The 3D model processing method provided by the embodiment of the present invention directly generates the shadow map and ambient light occlusion effect of the 3D model according to the material of the 3D model specified by the producer, which saves the time for making the model and reduces the time for the producer to learn modeling. time and cost.

The invention provides a model rendering method, device and equipment and a storage medium, and relates to the technical field of model rendering. The method comprises the steps: performing illumination rendering on a to-be-rendered object model according to pre-acquired illumination rendering information of the to-be-rendered object model; performing diffuse reflection rendering on the model after illumination rendering based on a pre-acquired diffuse reflection map; performing mapping rendering on each spatial direction according to the texture coordinates of each spatial direction in the model after diffuse reflection rendering and a shadow map acquired in advance; and according to the vertex normal of the to-be-rendered object model, mixing rendering results in all directions after maprendering to obtain a target object model. According to the target model obtained through the method, the problem of map offset caused by displacement of the model is well solved, so that the authenticity of a rendered picture is improved, and the visual perception of a user is improved.

The invention discloses a multiple-light source rendering method based on virtual spherical light sources. The multiple-light source rendering method comprises the step 1 of establishing the virtual spherical light sources according to scenes, the step 2 of calculating the illumination intensity of each point on a sampling surface by use of the virtual spherical light sources, the step 3 of building an illumination intensity matrix of the virtual spherical light sources on the sampling surface, and obtaining the illumination intensity of each point on the sampling surface by virtue of matrix overlaying to obtain the final rendering result. The multiple-light source rendering method based on the virtual spherical light sources is characterized in that the light energy of a point light source is distributed by use of the virtual spherical light sources, a smooth surface can be well supported and distortion of scenes is avoided. In addition, the efficiency of the rendering process of the multiple-light source rendering method is greatly improved by virtue of the shadow mapping, namely shader capacity, of GPU, and by virtue of the calculation capacity of the GPU.

The invention discloses a method for generating a high-precision simulation point cloud model. The method comprises the following steps: acquiring a production line scene model established in robot simulation software; in a coordinate system matched with the production line scene model, rendering the production line scene model by utilizing a shadow mapping method according to a set light source position to obtain the production line scene model with a correct shadow relationship; rendering the production line scene model with the correct shadow relationship by using a texture mapping method to obtain virtual projection of the scene; performing scene image acquisition on the virtual projection according to the pinhole imaging model; and decoding the acquired image, and calculating three-dimensional coordinates of the spatial points to generate a simulation point cloud model. The high-precision simulation point cloud model can be generated, and the model can be subsequently used for carrying out noise reduction processing on the actual point cloud model.

The invention discloses a linear shadow mapping method of de-pixeldined contour line reconstruction. The linear shadow mapping method comprises the following steps: (1) drawing a scene from a light source space, storing a depth value of a pixel center as a first shadow mapping, deviating in x and y directions for half texture pixel to obtain a second shadow mapping, and forming a linear shadow mapping by the first shadow mapping and the second shadow mapping; (2) drawing the scene from a vision field space, converting pixels into the light source space, and classifying the pixels into contour line pixels and non-counter line pixels; and (3) for the non-counter line pixels, using linear interpolation to calculate the depth of an occluder, and comparing the depth value to obtain a shadow result, and reconstructing a shadow boundary by a de-pixeldined contour line reconstruction method for the contour line pixels. The linear shadow mapping method of the de-pixeldined contour line reconstruction can guarantee the smoothness of the shadow counter lines and can effectively weaken a deformation phenomenon in the shadow mapping method by small storage overheads.

Embodiments of the invention provide a shadow rendering method and device, and electronic equipment. The method comprises the steps of determining a light direction according to a current position of a rendering target; selecting target shadow information corresponding to the light direction from multiple segmentation directions, acquiring a target shadow map according to the target shadow information, wherein the segmentation direction corresponding to the target shadow information is the segmentation direction closest to the light direction; completing the shadow rendering according to the target shadow map; and confirming that the position of the rendering target is changed, and repeating the process to complete the mobile rendering of the rendering target. According to some embodiments of the application, the rendering of the moving object is realized based on the pre-stored hard shadow information of each segmentation direction, so that the calculation amount is saved, and the shadow rendering effect of the embedded terminal on the moving object is improved.

The invention discloses a three-dimensional scene global illumination effect drawing method based on adaptive virtual point light source sampling. According to the method, a direct illumination resultof a three-dimensional scene is drawn by using a rasterization and shadow mapping technology. The method comprises the following steps of: drawing indirect illumination of a three-dimensional scene;an initial candidate virtual point light source set is generated by creating a reflection shadow map; the illumination contribution of each virtual point light source in the candidate virtual point light source set to the shadow area in the visual area is adjusted; a discrete probability quality function required by importance sampling is constructed, virtual point light sources which play an important role in enhancing global illumination visual quality are selected through importance sampling, the virtual point light sources are used for irradiating a virtual three-dimensional scene, and anapproximate indirect illumination result of a visual area is calculated. According to the method, under the condition that a small number of virtual point light sources are used for irradiating the three-dimensional scene, the visual quality of a drawn three-dimensional scene global illumination picture can be improved.

The disclosed embodiments use 3D city models and shadow mapping to improve altitude fixes in urban environments. In an embodiment, a method comprises: generating a set of three-dimensional (3D) candidate positions in a geographic area of interest; predicting global navigation satellite system (GNSS) signal visibility at selected ones of the 3D candidate positions; receiving GNSS signals at a current location of the mobile device; determining observed satellite visibility based on the received GNSS signals; comparing the predicted satellite visibility with the observed satellite visibility; determining a position fix based on a result of the comparing; determining an indoor environment where the mobile device is located based at least on an altitude component of the position fix; obtainingstructural data for the identified indoor environment; and determining a floor lower bound for the current location of the mobile device based on the altitude component and the structural data.

The invention discloses a general assistant technique for generating a shadow through a shadow map. The technique comprises the following steps: carrying out precomputation on a contour template to obtain a contour sampling point lookup table; drawing a scene in a light source space and forming a linear shadow map with a shadow map algorithm based on uniform point sampling being combined; drawing a scene in a vision field space, transferring pixels to the light source space and classifying the pixels into contour pixels and non-contour pixels; for the non-contour pixels, using linear interpolation to calculate depths of shielding objects and comparing the depth values to obtain a shadow result; and for the contour pixels, reading contour sampling points in the pre-constructed contour sampling point lookup table through local similarity relation, and obtaining a shadow result according to the position relation of the pixel coordinates and the contour sampling points. According to the general assistant technique for generating the shadow through the shadow map, on the basis of the conventional shadow map algorithm, less extra performance overhead is used, and shadow generation quality or algorithm performance of the algorithm is improved.

The invention relates to a virtual environment interface display method and device, computer equipment and a storage medium, and relates to the technical field of virtual environments. The method comprises the steps of obtaining editable types of editable objects in a three-dimensional virtual environment, wherein the editable types comprise a shape fixing type or a shape non-fixing type; obtaining a first shadow map of the editable object according to the editable type; displaying a virtual environment interface containing the editable object according to the first shadow map. In this scheme,when the terminal displays a three-dimensional virtual environment, for an editable object in a virtual environment, according to different types of the editable objects, the shadow maps generated indifferent modes are obtained, and real-time illumination rendering does not need to be performed on all the editable objects, so that consumption of cache resources and operation resources in the process of displaying the interface of the three-dimensional virtual environment is reduced, and the terminal performance when the three-dimensional virtual environment is displayed is improved.

The embodiment of the invention provides a virtual model rendering method and device, and the method comprises the steps: baking a virtual model in a plurality of illumination directions, and obtaining a plurality of shadow maps, wherein the shadow maps at least comprise the shadow information of the virtual model in the corresponding illumination direction; synthesizing the plurality of shadow maps to obtain static shadow information of the virtual model; obtaining dynamic shadow information of the virtual model in operation of the game engine in real time; super-positing on the static shadow information and the dynamic shadow information to obtain target shadow information; and rendering the virtual model based on the target shadow information. According to the embodiment of the invention, the invention achieves the quick synthesis of the static shadow, combines the static shadow with the dynamic shadow, and improves the overall self-shadow effect of the virtual model.

A method of rendering an image of an environment is disclosed. Environment data for the environment is accessed. The environment data corresponds to a frame of a video. A plurality of subframes associated with the frame is determined. An angle for each of the plurality of subframes is determined. One or more lights corresponding to the environment are selected. For each light of the one or more lights, a shadow map is generated. The shadow map corresponds to a subframe of the plurality of subframes based on a frustum view oriented at the angle determined for the subframe. The image of the environment is rendered. The rendering includes using the generated shadow map for each light of the one or more lights.

The invention discloses a viewpoint-dependent shadow map creating method. A view frustum is clipped to obtain a shadow visible space, and then shadow maps are created on the basis of the shadow visible space. The viewpoint-dependent shadow map creating method includes particular steps of (1), clipping the view frustum: deleting non-shadow spaces of view frustum portions to form a clipped strict shadow surrounding space called as the shadow visible space which is the minimum space for generating the shadow maps; (2), generating the shadow maps: generating light ray frustums, segmenting the shadow visible space and rendering objects in the light ray frustums by the aid of shadow cameras to obtain the shadow maps. The viewpoint-dependent shadow map creating method has the advantages that the non-shadow spaces are eliminated, and accordingly the problem of overlapping of spaces between existing shadow maps can be solved; the shadow maps are assuredly matched with resolution of screen pixels by the aid of a bidirectional segmentation algorithm; the non-shadow spaces are removed by the aid of a process for clipping the view frustum, and accordingly the space utilization rate of the shadow maps can be greatly increased.