Content-Driven Multipass Rendering in UE4

on YouTube ↗01h 16m

" summary

Shows how Blueprints and materials use draw material to render target plus scene captures to prototype effects without engine code: flow maps, pseudo volume textures, character hit masks by unwrapping mesh UVs and accumulating damage into textures, and caustics made either by a scatter mesh needing up to 16 million photons or a gather renderer that drops a 4K brute force hour render to about a minute via grid subdivision. Implements semi‑Lagrangian Navier‑Stokes with advection/divergence/pressure (Jacobi) — examples use ~400 iterations and 3D sims are heavy so results are usually baked flipbook.

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" chapters (34)

1. 0:00Intro
2. 0:50Multi Pass Rendering - What?
3. 1:08Main Methods • Drawing Materials Directly to Render Targets
4. 1:25And then they rejoiced
5. 2:04Simple Drawing to RT
6. 2:43Controlled Painting • Use Material Instance Dynamic - "MID"
7. 4:26Painting Examples
8. 6:45Volume Painting
9. 9:32VR Painting Example
10. 10:43Bringing in the Scene Capture
11. 11:09Mesh Paint Basics Draw UV layout storing Positions
12. 12:41Positional UV Map Material
13. 13:42Decal Style Projection
14. 15:05Dynamic Character HitMask • On Damage, Capture updated UV map
15. 16:05Hitmask in Action!
16. 18:21Caustics Time!
17. 20:12Refraction makes Caustics
18. 21:39Snell's Law Refraction
19. 29:59Building Gather Renderer
20. 31:09My Approach? Scan Line Rendering!
21. 33:49Speeding things Along - GPU Parallelism Take advantage of Critical Angle
22. 34:11Parallel Rendering
23. 35:15Storing to a Flipbook
24. 36:44Accidental Discoveries
25. 37:27Chromatic Abberration
26. 42:43Integrating Pre-Rendered Caustics
27. 45:03Fluid Simulation
28. 47:38What is Divergence Exactly? Measure how much fluid enters vs leaves each cel
29. 48:35Navier-Stokes Fluid Sim Steps
30. 50:49Advection
31. 55:05Poisson Pressure Equations
32. 57:48Subtracting Pressure Gradient Sample Pressure at 4 offsets to derive Gradient
33. 58:23Temperature Buoyancy
34. 59:43Fluid Sim in Action

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