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Caustic

A physically based path tracer, running live on your GPU.

Drag to orbit · scroll to dolly · click an object to edit it · double-click to set focus

0 spp 0 fps 0 Mpaths/s 0×0

Selected object

Click anything in the render to edit its material. Walls, floors and lights count too.

Lens

Field of view

Aperture

Focus distance

Exposure

Light

Ceiling lamp power

Lamp color

Sun elevation

Sun azimuth

Sun strength

Sky brightness

Integrator

Max bounces

Samples per frame

Resolution

Firefly clamp

How it works

Every frame, each pixel fires a camera ray through a thin lens and bounces it around the scene, sampling a GGX microfacet model, Fresnel glass and area lights with next-event estimation and multiple importance sampling. Frames average into a float buffer, so the image sharpens the longer you hold still. Nothing is precomputed; it is one fragment shader.