This tutorial aims to demonstrate how to use the motion_vector AOV in a pool ball scene. There are two methods to generate motion vectors, one using a shader and the other using a built-in AOV that Arnold provides. We will demonstrate how to generate motion vectors for the cases where it is desirable. However, it can be sufficient in some cases. This type of motion blur is lower fidelity it does not capture lighting changes as an object moves, nor complex interactions of depth relative to the camera.
In some cases where there are severe time constraints, it may be faster to instead output motion vectors and blur the images in a compositing package afterward. This requires using more AA samples to resolve noise from motion blur, but often those samples are needed anyway for noise resulting from the depth of field, direct and indirect lighting, volumetrics, and so on. I know it's difficult without an example object, but I'm hoping somebody has seen this problem before.Motion blur in Arnold is generally best accomplished by using the natural motion blur support, where transforms and vertices of objects are sampled over time from a camera's shutter open to shutter close. The normals have been averaged in maya using Normals > Average Normals from the Polygons menu set. I noticed this discrepancy when trying to extract normals on an object whose vertices are on the seam border with another object. Mesh.getVertexNormal(523, False, space=om.MSpace.kWorld) The maya python API call (gives me a different result): # empty selection list
Python commands (gives me the result i want): cmds.polyNormalPerVertex(".vtx", q=True,normalXYZ=True)
I've noticed that I get different results when using the python API instead of the maya python commands. I'm trying to extract the vertex normal of a mesh object at a particular vertex.
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