H2O Posted February 7, 2014 Share Posted February 7, 2014 Hi everyone, Since a long time on this forum but first post. I always found a solution that already exist here, but today... First of all, let me explain the effect I want to do. For some production, I have to reconstruct a ring (like a torus) and make a "compression" of it (to make it more solid). I don't know if i'm really clear but the meaning is, I create a displacement node in vopsop to make this effect. To manipulate the "compression" like i want, i create a map in cops to keep back the color data (or luminance) and use it with the displacement node. With a single image, it works perfectly. But (yes there is always a "but"!!) here is the issue: When i want to use a sequence (to have a animated displacement), Houdini crash, or it doesn't care of the sequence and use only the first pic. I always found a solution without picture, I used an animated torus with a points from volume sop and an attribute transfer sop to keep back the red color. But I really want to use a pic sequence to make a better animation... Obviously, it's not very clear, so I made a little hip file with a simple grid for you to see what i mean. Maybe someone could enlight me about this or tell me about another way to do this. Thx by advance. Cheers, Paul ANIMATED_COP_TO_SOP_ISSUE.hip Quote Link to comment Share on other sites More sharing options...
Skybar Posted February 7, 2014 Share Posted February 7, 2014 I don't know about this, but; after you created the images in COPs and written them to disk - can't you just skip COPs altogether after that, and just read the images from disk directly? Quote Link to comment Share on other sites More sharing options...
H2O Posted February 7, 2014 Author Share Posted February 7, 2014 I Skybar, I already test this option and I'd got the same problem. Maybe a bug in H13?... I read something about link problems between COPs and SOPs. Quote Link to comment Share on other sites More sharing options...
Skybar Posted February 7, 2014 Share Posted February 7, 2014 Yeah I mean, don't read them from disk in COPs, read them back in directly in SOPs. So you skip COPs entirely. Quote Link to comment Share on other sites More sharing options...
H2O Posted February 7, 2014 Author Share Posted February 7, 2014 Thx, I tried it. But in VOPs, ColorMap node and Texture node "cannont have channels which depend on time". In other words, no image sequence. And when I read them directly with a material, i can't find a way to have "Cd" attribute from material :/ Quote Link to comment Share on other sites More sharing options...
H2O Posted February 7, 2014 Author Share Posted February 7, 2014 Ok, with an AttribFromMap SOP, it works perfectly... I just have to write my COPs like you said and read the attribute I want with this node. So simple, sorry for the distrubance Thx Quote Link to comment Share on other sites More sharing options...
Guest tar Posted February 7, 2014 Share Posted February 7, 2014 Hi H20, can you post your solution up please, it really helps everyone who needs to resolve similar issues. Thanks! Quote Link to comment Share on other sites More sharing options...
H2O Posted February 10, 2014 Author Share Posted February 10, 2014 Hi Marty, No problem, here is the right Hip file. Cheers, ANIMATED_COP_TO_SOP_OK.hip Quote Link to comment Share on other sites More sharing options...
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