Escher for Nuke is a suite of image generators and 2.5D creative tools designed for Nuke compositors who are looking for tools to explore the creative possibilities stashed between 2D and 3D. Spherical Harmonics lighting tools, Depth-based Ambient Occlusion, Advanced glossy shader and powerful 2.5D data processing nodes of Escher enable creative 3D image making in a different way while taking full advantage of the organic nature of 2D image processing and manipulation. Escher’s powerful real-time image generator nodes SkyWalker and Caustix are perfect light sources for image based lighting workflow.
Escher relies on 2.5D images input, both depth images (or gray-scale images) and 3D normal map images are regarded as 2.5D images to Escher. Depth image is interpreted by Escher as the distance of each pixel from the camera, so it essentially contains information more than just a plain 2D image. Normal map image provides the normal vector direction of each pixel which is good enough for shading purpose.