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About chrish

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  1. you might want to try this thread on the SESI forum: https://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=30392&start=0&postdays=0&postorder=asc&highlight= I posted a hip file there that I think will do what you need.
  2. Alembic Vray attributes

    I'm not sure what applications you are working with pre/post houdini, so I am not sure if my experience relates to yours. There may be better ways, but this has worked for me. I am exporting alembic from maya. In the export options, I add an entry for an attribute named "vraySubdivEnable". When reading the archive in to houdini (H13) with an Alembic SOP, I remap the "vraySubdivEnable" attribute to"creaseweight". I then promote & recast creaseweight to a vertex float attribute, and remap the values as needed (e.g. fit($CREASEWEIGHT,0,1,10,0)). The results can be displayed with a subdivide SOP, or in mantra with "Render Polygons as Subdivision" on at the object level. I'm not sure if the same can be accomplished with the Alembic SHOP procedural, other than as documented in the "User Properties" section. -Chris
  3. Hello, Is there a simple way of preserving Parameter Interface channel links when relocating a VOP (e.g. cutting a VOP and paste it inside another VOP [nesting it deeper])? I've promoted a heaps of VOP parameters to a shader interface, but now would like to move that part of the network inside of another VOP block. The links/channel references do not update to the new location. Is there a straightforward way of updating the links that avoids manual rebuilding? thanks, Chris
  4. POP Solver jitter

    Increasing the sampling worked pretty well. Thank you.
  5. POP Solver jitter

    Are there any techniques for eliminating the jitter that seems to happen when particles come to rest in DOPs using the POP solver? The POP solver is handling collisions, with bounce active. I'd like the particles to eventually come to rest. RBD Autofreeze does not appear to be a solution in this case. Thanks, Chris
  6. hscript pulse-wave modulation?

    thanks, this works nicely.
  7. hscript pulse-wave modulation?

    I'm trying to find an hscript expression that will generate a pulse signal where the pulse interval and the pulse width can be easily controlled and vary with time. I've trying an expression like this . . . pulse(fit($F % (ch("pulsefreq") * rand($F)),0,ch("pulsefreq") * rand($F),0,1),ch("pulselow"),ch("pulsehi")) . . . using the modulo operator on frame values. I can get something close, but it is still difficult to control the width and interval of the pulses in an easy way. Any suggestions (using hscript) would be appreciated. Thanks, Chris
  8. I was wondering if anyone knew of a scheme for producing multisegment motion blur for changing topologies. Is there a way to sample geometry velocity blur at multiple segments? thanks, Chris