OM3D

EPITA course for 5th year students

Slides: https://docs.google.com/presentation/d/1qJhH0cmEMVQRhF37UOYDdw0ZKtd00_oQXW1dZrUbSL4/edit

TP1: https://hackmd.io/@G2s9zdzlSd-RfTlBoN_x2A/ryY2BSgVo

TP2&3: https://hackmd.io/@G2s9zdzlSd-RfTlBoN_x2A/Bkm_EOFHo

How to build

Requirements: cmake 3.20 minimum, C++17, and OpenGL 4.5.

# At the project root
mkdir -p TP/build/debug
cd TP/build/debug
cmake ../..
make

Authors of base code

If you have a problem, please send a mail to

• [email protected]
• [email protected]

Authors of the improvements

Yorick Madelain - Ancelin Bouchet

Features of the project

• Frustum culling
• Backface culling
• Instancing
• Deferred shading
• Volume lightning
• Occlusion culling
• Temporal anti aliasing (TAA)

Occlusion culling

• Makes use of opengl occlusion queries
• Hierarchy for objects is just front to back
• Doesn't use bounding boxes for dry rendering because it would break everything
• Disables instancing

TAA

• Accumulates multiple frames to smooth contours removing aliasing
• Camera moves a little each frame (jitter) to add variation, pixel may be filled or not with the correct probabilities on edges
  • Jitter values generated using the repeated first 16 values of a Halton (2,3) sequence
• Double buffered color and depth textures for historisation
• Sampling current frame by weighted averaging 3x3 neighbourhood (filter: Mitchell-Netravali)
• History sampled with closest (depth) velocity then clipped around current sample neighbourhood
  • Both of these help reject sample when disocclusion happens
• Mix between current and history sample favoring history heavily, depending on luminance

Some artifacts are present