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The Volume Analysis operation computes analytic properties of the volumes, such as the gradient and curvature. This is done in the local space of the volume. These are a function of more than one voxel so are more difficult to compute inside a Volume VOP.
Where possible, these operations occur in place and preserve the name. If new
volumes have to be created, it is attempted to ensure they gain the
.z style suffixes in their name attribute.
The length is calculated by measuring the slope of increasing values. For example, if temperature rises faster over a shorter distance, it will create a bigger gradient. If temperature is a height field, then gradient length is how steep the hill is.
This node currently only works with standard Houdini volumes. It does not work with VDBs.
The volume primitives to be analyzed.
The types of analysis that will be performed.
This example shows how to use the Volume Analysis SOP to compute the curvature of a volume and colour the original points from the curvature values.