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gkjohnson / three-gpu-pathtracer

Path tracing renderer and utilities for three.js built on top of three-mesh-bvh.
https://gkjohnson.github.io/three-gpu-pathtracer/example/bundle/index.html
MIT License
1.35k stars 133 forks source link

Looking for recommendations to Create a physically accurate sun #674

Open Drosaca opened 5 days ago

Drosaca commented 5 days ago

Hi, I' m trying to create the sun in space (as a light emitting object if it's feasible) with a light source as physically accurate as possible.

I was wondering if someone has any recommendations on which kind of light sources I shoud use (AreaLight or PhysicalSpotLight) and which values I should tweak to get the best result.

thanks,

gkjohnson commented 3 days ago

Your best bet for getting some kind of realistic sun and sky effect is probably to use an environment map for lighting.

Drosaca commented 23 hours ago

My goal is to simulate sunlight hitting a distant object from various angles in space and render an image that closely resembles what a real camera would capture when pointing at the dark night sky.

Initially, I was considering creating the sun either as an object that emits light or as an invisible light source to simplify its positioning relative to the object . Do you think this path tracer can handle such a simulation? Additionally, do you still believe that using a normal map would be the better approach here? If this simulation doesn’t face any known limitations, I would greatly appreciate any suggestions on the types of objects or parameters that would help achieve the most realistic results.