Distributed global illumination calculating method based on photon mapping

Abstract

The invention discloses a distributed global illumination calculating method based on photon mapping. The method comprises a master node reads a scene file, scene data is divided and stored in a distributed manner, and according to emitted photons, the master node constructs a global photon graph and sets a photon overlap range; communication between the master node and slave nodes is constructed; the master node divides the whole screen pixel space into multiple blocks, each block serves as a rendering task, rendering tasks are distributed to the slave nodes in the clockwise sequence from inside to outside, and the slave node obtains the tasks distributed by the master node and adds the task into a queue, and determines task ownership of each coloring point in the block; the slave node traverses the global photon graph in the surrounding of each coloring point, and collects an indirect illumination color value obtained by photons, namely a rendering result; and each slave node returns the rendering result to the master node, the master node merges all the obtained rendering results according to the priority, and a rendering picture is generated. According to the invention, the rendering speed and effect are improved.

Description

technical field [0001] The invention relates to the field of realistic rendering of graphics, in particular to a method for calculating distributed global illumination based on photon mapping under the Intel MIC hardware architecture. Background technique [0002] Scene rendering is to color the scene, and process the light and the material of the object in the scene into the form of an image. In the rendering of large-scale scenes, the scene data is very large, and in order to achieve excellent global illumination, the rendering time will also be very long. [0003] Global illumination, showing the combined effect of direct lighting and indirect lighting. When the light hits the subject, it reflects regular or diffuse light, which controls the color, reflection, refraction, caustics and other light effects of the interaction between objects, and finally deduces the realistic natural light. Therefore, when rendering, in order to achieve real scene effects, global illuminat...

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Problems solved by technology

[0004] Because the global illumination takes up a lot of memory space, the existing global illumination calculation methods have the following problems: (1) the storage load of the calculation node is large, which is not suitable for the rendering of super-large scenes; (2) due to the use of a single machine for rendering, the The rendering speed of the scene is slow; (3) No optimization scheme is proposed in the process of rendering boundary points, and rendering deviation may occur, which makes the rendering result inaccurate, and eventually leads to the problem of poor global illumination effect

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