Raytracing Part II

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The second part of the Introduction to new NVidia RTX graphics cards architecture and new Raytracing pipeline in DirectX12 (DXR) and Vulkan 1.2 libraries used in real-time rendering.

Technology

Raytracing
PART II
@jorge_magic
/in/jorgecanton

Ray Generation Shader
Main Functions
DispatchRaysIndex()
DispatchRayDimensions()
TraceRay(..)

Simple Ray
t=0
t=1
t=1.5
A
B
P(t) = A + tb
b

Closet-Hit Shader
Main Functions
WorldRayOrigin()
WorldRayDirection()
RayTCurrent()
PrimitiveIndex()

Triangle barycentrics coordinates
A B
C
P = wA+uB+vC
u
v
w
P
Barycentric (u, v, w)

Triangle barycentrics coordinates
A B
C
P = (1-u-v )A+uB+vC
u
v
w
P
Normalized barycentric coords
1 = u + v + w
P = wA+uB+vC
Barycentric (u, v, w)

Triangle barycentrics coordinates
A (0,0,1) B (1,0,0)
C (0,1,0)
P = (1-u-v )A+uB+vC
u
v
w
P
P = A = 1A + 0B +0C
P = B = 0A + 1B +0C
P = C = 0A + 0B +1C
Barycentric (u, v, (1-u-v ))

Triangle barycentrics coordinates
A (0,0,1) B (1,0,0)
C (0,1,0)
u
v
w
P
P = (1-u-v )A+uB+vC
Barycentric (u, v, (1-u-v ))

Raytracing Noise Challengue
Scattered rays Random.NextDouble(); White Noise

Raytracing Noise Challengue
White Noise Blue Noise

Raytracing Noise Challengue
White Noise
Gaussian Blur
Blue Noise
Gaussian Blur

Raytracing Noise Challengue
Random Points Stratified Sampling
(Jittering)

Raytracing Noise Challengue
Uniform distribution Light distribution PDF distribution

Nowdays Raytracing is expensive
EA: Hybrid ray tracing in PICA PICA

Nowdays Raytracing is expensive
Deep Learning Super Sampling

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Raytracing Part II

1. Raytracing PART II @jorge_magic /in/jorgecanton

2. Ray Generation Shader Main Functions DispatchRaysIndex() DispatchRayDimensions() TraceRay(..)

3. Simple Ray t=0 t=1 t=1.5 A B P(t) = A + tb b

4. Closet-Hit Shader Main Functions WorldRayOrigin() WorldRayDirection() RayTCurrent() PrimitiveIndex()

5. Triangle barycentrics coordinates A B C

6. Triangle barycentrics coordinates A B C P = wA+uB+vC u v w P Barycentric (u, v, w)

7. Triangle barycentrics coordinates A B C P = (1-u-v )A+uB+vC u v w P Normalized barycentric coords 1 = u + v + w P = wA+uB+vC Barycentric (u, v, w)

8. Triangle barycentrics coordinates A (0,0,1) B (1,0,0) C (0,1,0) P = (1-u-v )A+uB+vC u v w P P = A = 1A + 0B +0C P = B = 0A + 1B +0C P = C = 0A + 0B +1C Barycentric (u, v, (1-u-v ))

9. Triangle barycentrics coordinates A (0,0,1) B (1,0,0) C (0,1,0) u v w P P = (1-u-v )A+uB+vC Barycentric (u, v, (1-u-v ))

10. Raytracing New Shader functions

11. Raytracing New Shader functions

12. Raytracing techniques (AO)

13. Raytracing techniques (Shadows)

14. Raytracing techniques (Reflections)

15. Raytracing techniques (GI)

16. Raytracing Noise Challenge Quake2 RTX

17. Raytracing Noise Challengue Scattered rays Random.NextDouble(); White Noise

18. Raytracing Noise Challengue White Noise Blue Noise

19. Raytracing Noise Challengue White Noise Gaussian Blur Blue Noise Gaussian Blur

20. Raytracing Noise Challengue Random Points Stratified Sampling (Jittering)