Скачать или смотреть Low power tree shader for Unity - Demo presentation

This video presents in-dev asset for Unity Engine. The goal is to create low-power tree shader with wind simulation and improved shading of treetop.

The shader simulates gradual increase of light occlusion trough the treetop and computes local wind strength, direction, and then movement of the tree itself. The wind has four global parameters - main magnitude, magnitude turbulence, direction and direction turbulence. The wind simulation does not require vertex colours or any other additional mesh data.

The asset will feature simplest shaders for built-in pipeline with basic legacy shading, Unity 5 standard shader based implementation, and HDRP shader graph implementation. The HDRP shader is usable for both leaves and bark.

Current vertex shader implementation performs four texture samples of single 64x64 texture, 2 normalizations, 3 divisions, 1 cosine, 1 sine and 1 arcus cosine calculation.
Fragment shader contains 1 square root, 1 division and 1 length calculation.
The computational complexity of wind shaders is in general negligible next to complexity of fragment shaders, especially in HDRP, but could be significant on legacy and mobile shaders.