Shader

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....

Valhall uses index-driven vertex shading to compiles vertex shaders into two binaries: Position Shader and Varying Shader. Position Shader computes only position and is executed for every indexed vertex. Varying Shader computes the remaining non-position attribute outputs. It’s only executed for vertices that are part of a visible primitive that survives culling. Work Registers Uniform Registers Stack spilling: how much memory is stacked because variables spilled spill: when there are not enough registers to keep the variables, some of them may be moved to and from RAM....

Vertex Color, Alpha and Shadow Surface shader is actually a vertex and fragment shader too, so theoretically the vertex data is accessible in surface shader too by using SEMANTICS or common state vert struct v2f { half4 color : COLOR; }; As for the Alpha Texture, we can decide the color based on the UV mapping in vertex function fixed4 frag (v2f i) : COLOR0 { ... fixed alpha = tex2D (_AlphaTex, i....