1. A method, comprising: rendering a first shadow map from a light source for one or more triangles; increasing, by a geometry unit, a size of the one or more triangles by moving each edge of the one or more triangles outward to produce increased one or more triangles; rendering a second shadow map from the light source for the increased one or more triangles; for each pixel associated with a surface, determining whether the pixel is a low confidence pixel by: querying a first texel associated with the pixel in the first shadow map, querying a second texel associated with the pixel in the second shadow map, determining whether the first texel is equal to the second texel, and if the first texel is equal to the second texel, then the pixel is not a low confidence pixel, or if the first texel is not equal to the second texel, then the pixel is a low confidence pixel; and for each low confidence pixel, tracing one or more shadow rays to the light source to determine a shading value for the low confidence pixel.