Unity

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....

Q; The ways of optimizting? Static Batching. Objects are explicitly specified to be static. It can’t have any change in transform. It also requires additional memory to store combined geometry. 100 objects are 100 copy. Dynamic Batching The mesh and materials need to be the same, and the mesh must have less than 300 vertices. The objects should not moving around. Shaders should have one pass. Instanced materials and lightmapping are not allowed....

Achieving 60FPS on mobile, Youtube Optimizing Graphics in Unity, Unity Overdraw Overdrawn is to draw one pixel more than once. Post-processing will re-touch the pixel at least once. It adds burdens to the GPU and delays the frame. Rendering is done by draw calls. The intermediate steps are not on the screen but in frame buffers. A frame buffer is a memory buffer that contains data representing the pixels in a complete video frame....