StencilShadowVolume.Shader from CesiumJS to Unity

[lLcrowe-dev]

Ported the stencil shadow volume shader from CesiumJS to Unity (For URP).
support for stencil shadow volume rendering technique in order to render vector shapes visualize on terrain.

(My colleague @TomLeeLive is planning to do PR for VCTR polygon mesh processing, and it would work well together with this functionality.)

Instruction.
Follow this Step

//Project Setting

1. In ProjectSetting >> Graphics >> ScriptableRenderPipelineSetting
2. Select SRPSetting >> Rendering >> index0 (UniversalRendererData)
3. AddRendererFeature >> Add 2 more "RenderObjects (Experimental)" A, B
4. Set A B RenderObjects >> Layer Mask >> "Everything"
5. A RenderObjects >> Filters >> LightMode Tags >> Add "Step1"
6. B RenderObjects >> Filters >> LightMode Tags >> Add "Step2"
7. Sort this role A(Step1), B(Step2)

//Create Material

1. In Shader "CesiumToUnityStencilShadowVolume"
2. Select And RightMouseClick >> Create >> Material
3. Choose Color

// Use case example

1. Return the Scene. And Create cube.
2. Apply the Material(CesiumToUnityStencilShadowVolume) To the cube >> Set Scale (1, 20, 1)
3. Create Other Cube >> Set Scale (100, 1, 100)
4. Select Apply the Material cube >> Overlap the two cube