An OSG-based efficient volume shadow generation method

Abstract

The OSG-based efficient volume shadow generation method comprises the following steps of 1, preprocessing an OSG model, traversing a triangular surface of the OSG model, and generating vertex data containing adjacency information; Step 2, transmitting adjacent vertex information into a GPU, and generating a shadow cone through a geometric shader; and step 3, starting a double-sided template test and then rendering a shadow cone to generate a shadow. According to the method, on the basis that the original advantages of the ShadowVolume technology are guaranteed, the shadow generation efficiencyof the complex object is improved.

Description

technical field [0001] The invention belongs to the technical field of computer graphics, in particular to an OSG-based efficient volume shadow generation method. Background technique [0002] In the field of computer graphics, real-time shadow technology, as a general technology, is often used to enhance the reality of the scene. At present, the mainstream shadow technology mainly includes ShadowMap and ShadowVolume. [0003] ShadowMap is often used in large scenes, because its implementation process is less related to the geometric complexity of the scene, so it is more efficient. But its disadvantage is that due to the limited size of the image used to save the depth texture, there will be jagged edges on the shadow. In addition, in a large scene, a single object occupies fewer pixels, resulting in rough shadows generated by it, especially the lower quality of shadows cast on itself. [0004] Therefore, ShadowVolume is a more suitable method when we have requirements fo...

AI Technical Summary

Problems solved by technology

In the usual ShadowVolume, the generation process of the shadow cone is completed in the CPU, so when the model has too many patches, it will seriously affect the generation speed of the shadow cone, thereby reducing the efficiency

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