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Light URP has only one main light. It must be the directional light. If it is not set in the Sun Source, then the brightest directional light is the main light. Test it with the light direction. half4 color = half4(_MainLightPosition.xyz, 1.0); Stencil Manual: https://docs.unity3d.com/Manual/SL-Stencil.html YouTube: https://www.youtube.com/watch?v=-NB2TR8IjE8 The stencil buffer stores an 8-bit integer value for each pixel in the frame buffer. Stencil test happens before executing the fragment shader. It will compare the value with the reference value....

Blend Textures (Multitexturing) http://untitledgam.es/2017/01/height-blending-shader/ A common way to blend textures is the alpha blending. $$C_{result} = C_{source} \cdot F_{source} + C_{destination} \cdot F_{destination} \ F_{source} + F_{destination} = 1$$ Another way is to do linear interpolation. We can linearly interpolate the result color between two textures. $$\frac{y-h_{0}}{x - x_{0}} = \frac{y_{1} - y_{0}}{x_{1} - x_{0}}$$ $$y = \frac{ y_0(x_1 - x) +y_1({x - x_{0})} }{x_1 - x_0}$$ The third way is to use the height map to determine the blend of two textures....

Render Texture OnRenderImage is an event function called after a Camera has finished rendering. It allows us to modify the Camera’s final image. Built-in: calls it on the same GameObject as an enabled Camera component. SRP: use ScriptableRenderPass instead. GetTemporary and ReleaseTemporary GetTemporary will return a RT for temporary calculations. Release it using ReleaseTemporary as soon as we’re done with it. Unity keeps an internal RT pool, so calling GetTemporary might return a created one if the size and the format are the same....

Shader Shader.SetGlobalVector(int nameID, Vector4 value)` Sets a global vector proper. Shader will use the global property if it is not defined in Properties block. example: `_LightDirection` in `ShadowCasterPass.hlsl ZTest Always sets NO depth testing. The geometry is drawn regardless of distance. Texels vs. Pixels Texels are the elements of a texture. While pixel is the element of an image. When we zoom in a 3D model, we may see 1 texel presented by many pixels....

hlsl float frac(float v) { return v - floor(v); } fmod(x, y) returns the floating-point remainder of the x parameter divided by the y parameter float remap(float v, float2 inMinMax, float2 outMinMax) { return outMinMax.x + (v - inMinMax.x) * (outMinMax.y - outMinMax.x) / (inMinMax.y - inMinMax.x); } float fresnelEffect(float3 normal, float3 viewDir, float power) { return pow(1.0 - saturate(dot(normalize(normal), normalize(viewDir))), power) } Shader Posterization / Posterisation is the conversion of a continuous gradation of tone to several regions of fewer tones, with abrupt changes from one to another....