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Reyes rendering is a method used in 3D computer graphics to render an image. It was developed in 1987 at Pixar for PhotoRealistic RenderMan.

The algorithm was designed to overcome the speed and memory limitations of photorealistic algorithms, such as ray tracing, in use at the time. In fact, Reyes stands for Renders Everything You Ever Saw.

The Reyes algorithm introduced the concept of a micropolygon, which is a polygon that is at least as small as a pixel in the output image. These micropolygons are directly scan converted to produce the output image.

The basic Reyes pipeline has the following steps:

1. Transform. Transform objects from their own coordinate systems to the coordinate system of the virtual camera.
2. Bound. Calculate the bounding volume of each object.
3. Split. Split large objects into smaller objects.
4. Dice. Convert the object into a grid of micropolygons, each approximately half the size of a pixel.
5. Shade. Calculate lighting and shading at each vertex of the micropolygon grid.
6. Draw. Scan convert the micropolygons, producing the final 2D image.

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