[[08-01-01-Material]] [[15-01-01-Shading]] [[11-01-01-U_Rendering]] [[09-01-01-U_Optimisation]] [[03-01-01-Karma]] [[04-01-01-Mantra]] [[12-01-01-USD]] [[11-01-01-U_Rendering]]

render can be parallelized // sim - big gpu with massive vram! one gpu!

https://www.youtube.com/watch?v=khblXafu7iA https://youtu.be/gsZiJeaMO48

Rendering

Deferred - more lights is ok
Forward Rendering - better with translucency
Lighting
Light
Camera
Algebra
Unreal Material
Book : Phisical based rendering From theory to implementatnio

Karma
LOP

hlsl glsl

Rasterization

Real time mostly. Wievport or games.

Shooting rays from cam (primary rays), and sample shaders. Rays are inddependend (GPU friendly )
from point, ray to light and check angle to determine shading (hard shadow)
for soft shadows must eveluate more rays (distributed light trac), soft shad, bluty reflect (hard reflection need one sample, blury more) , dof, motion blur
expensive to calculate GI (indirect illumination)

https://fgiesen.wordpress.com/2011/07/09/a-trip-through-the-graphics-pipeline-2011-index/

Path Trace

Offline recently and now with RTX in realtime features Full indirect illum : Recursively evaluate hemisphere of multiple rays of each point we hit geometry.

Ray trace

trace from camera
if hit surface shoot ray to lightsource and evaluate shadow and reflections and refractions
indirect illumination (hard cost) we have to trace multiple rays depend of type of mat. Those patrhs not depend on eachother so we can calculate it independly (gpu).
light decay :(shoot trace from geo to light) and
- tradfitional: shoot ray to light
- path trace: (full indir illum) multiple rays and recursyvly calculate for each additional hits .

Shaders

Each thread is not just blind but also memoryless.
Shader Language has a single main function that returns a color at the end.
https://interplayoflight.wordpress.com/2021/04/18/how-to-read-shader-assembly/

Shader Rendering

reflect refract & scatter …

BRDF - bidirectional reflection distribution fn.
hemisphere for mat / and directional spike for reflective. More blurry reflection more direction samples > longer rendering
BTDF - transmission (reflective + (refracted + iro)) (so dielectric render slower ) (transmitted scattering distribution (distribution is every time medium is changed )
BSSRDF -Sub Surface Scattering. Diffuse is SS on tiny area !!!!!!!!!
BSDF - bidirectional scattering.

…

Materialx

EDF - Materialx Emission
VDF - Materialx Scatter in Volume

Vertex Shader (VS)

Pixel Shader (PS) (old: fragment shader)

grid of pixels that work paralel

Compute Shader

un out of rendering piepline so no inherently tide to verts, but u can couple thm toghether

its on gpu paralel > much larger workloads
update , compute, move data (move data vram<> to ram (using buffer/structbuffer/)not always cheap ) [biger problems more gains]

(subdivisions workgroups and in each group divisions)

Mesh Shader

Mesh Shaders

for new tessalation

Task Shader

call based of cam frustrum

Camera shaders

Light shaders

CRI color rendering index
if iluminated point id to 5x dist from light we can aprox as point light directional aprox to (rownolegle) dome light - hdri light

aproximation on physic lighting

sampling is costly
combinig textures to one help with streaming