This operator integrates a 3D image along the line specified by two points.
It works by marching along the given ray, integrating the value of
channel in the 3D texture space until the sum of the integration
limit. At that point, it stops. The output
the point position where the limit was reached, and
result will be 1.
Texture files will be searched for in the path specified by the
HOUDINI_TEXTURE_PATH environment variable.
3D image file used for look-up.
Channel to be integrated.
3D location in the image where to start integrating.
3D location in the image where to stop integrating.
Type of anti-aliasing filter to be used for evaluation. The options are:
Filter width in both u and v directions.
If less than 1, limited integration is done. If greater than 1, higher quality sampling is performed. The default value is 0. Please be cautioned that accurate filtering can be 10 times as expensive for even simple data sets.
Scale the value of the image by the value specified during the integration.