Houdini 13.0 Nodes

interface version 1

An alternative version of the original Ray SOP.

There are both advantages and disadvantages, compared to the original Ray SOP.

Advantages

  • Much faster, especially on large data sets and multi-threaded (the main reason for this OPs existence).

  • Can create both ray hit and ray miss point groups

Limitations

  • Can only work in Project Rays mode (no Minimum Distance mode)

  • No multiple ray samples (yet – although it’s very useful for geometry with holes)

  • Cannot import attributes from ray hits (AttribTransfer can be used as a workaround)

Parameters

For most parameter descriptions see the original Ray SOP documentation.

Ray Attrib

Create a vector attribute that points from the intersection points back to their original positions.

Flip

Reverse the direction of the Ray Attrib vectors.

Distance Attrib

Store individual ray distances in a float attribute.

Ray Hit Group

Add points to this group that hit the target surface.

Ray Miss Group

Add points to this group that missed the target surface.

TODO

  • Support multiple ray samples

  • Attributes from ray hits? (Can’t see any other way than attribtransfer right now...)

Release Notes

interface version 1 —

2013-08-14

Started implementing hit attribute import.

2013-08-03

First version.

On this page

Related topics