3 Computer Vision News Computer Vision News Rasterized Edge Gradients UKRAINE CORNER “Meshes can either be rendered using ray tracing methods or rasterization,” Stan tells us. “Ray tracing methods are typically slow, while rasterization is significantly faster. In our application, we’re particularly interested in fast methods that are also fast during training!” When fitting something to a dynamic sequence with significantly more data than a static scene, a fast method is required for rendering and backpropagating the gradients. However, differentiable rendering of surfaces is challenging because they create discontinuities when projected on the image plane, and this is even more challenging in the case of rasterization. In contrast, ray tracing is often considerably more computationally intensive, but it allows for principled approaches to handle discontinuities in images. With ray tracing, you compute an integral using Monte Carlo integration over the pixel area, and if there is a discontinuity, you take the integral, and it is no longer a discontinuity.
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