You will need rustc and cargo to run. You can get them at https://rustup.rs/
cargo run --release --example volumetric_pathtrace_lampshade
cargo run --release --example volumetric_photonphoton_lampshade
cargo run --release --example volumetric_beamphoton_lampshade
cargo run --release --example volumetric_beambeam_lampshade
You can find outputs in the lampshade directory. You can edit parameters in the example files see (examples/ directory). Note that only the examples above are made by us we, the rest are from base RPT and do not use volumetric materials.
Four different integrators to render scenes with volumetric media. They are as follows:
- baseline volumetric path tracing
- baseline volumetric photon mapping (point queries with point photons)
- volumetric photon mapping with query beams (beam queries with point photons)
- volumetric photon mapping with query beams against beam photons (beam queries with beam photons)
To clarify: the variation comes in how you lookup into the photon map. With baseline volumetric photon mapping you pick a point in the volume and blur to find other points near it. With query beams, you find all photon points within a radius of the camera ray you send into the scene. With query beams and photon beams, you store photons as line segments with a radius instead of single points, and you find all photon beams that pass near a camera ray you send into the scene. The advantage to this approach is you need far fewer photons in the map since the beams have a long extent.
Our work is primarily in src/photon.rs, src/medium.rs, src/renderer.rs, src/material.rs.