ioness Posted March 29, 2016 Share Posted March 29, 2016 Hi, I have a problem rendering some geometries with displacement using a camera exported from Maya in alembic format. If I render the scene using this one, there aren't any displacement visible but if I render it using a native camera from Houdini, there aren't any problem. Are there any solution ? Displacement Problem.rar Quote Link to comment Share on other sites More sharing options...
Skybar Posted March 29, 2016 Share Posted March 29, 2016 I haven't looked at your file - but are you scaling your camera? Quote Link to comment Share on other sites More sharing options...
ioness Posted March 29, 2016 Author Share Posted March 29, 2016 Yes, Is there any way to avoid this scaling ? (It's for a spaceship crash, the scene given to me was 100 times bigger) Quote Link to comment Share on other sites More sharing options...
Skybar Posted March 29, 2016 Share Posted March 29, 2016 Yeah you need to scale the transforms but not the camera itself. Theres a few topics here about that I think. Quote Link to comment Share on other sites More sharing options...
fathom Posted March 29, 2016 Share Posted March 29, 2016 two things: never scale a camera. if you get an alembic camera, first thing you should do is verify it's not scaled. you can do this by putting a unit sphere (as polymesh) as a child to your camera, then object merging it into a geo in world space (ie at the /obj level). then see how big it is. then insert a null above the camera to undo that scale (so if the geo is .1 radius, add a scale of 10). it's a huge drag with alembics -- particularly importing via the file dialog. for this reason, it's much better to create an alembic camera import node that can exclude the scale and generally make updating a billion times easier. and then the other aspect is always displace is object space. by default it's in "current" space (which is camera space in houdini). this means that scales on your object are ignore and the scale of the camera is used. generally speaking, you want your displacements to scale with any object scales you have. if you're using the displace along normals, you should toggle on the object space option. this will actually very likely fix your problem here, but it's possible you'll run into other problems still with a scaled cam (volumes are severely affected as well as lighting).... Quote Link to comment Share on other sites More sharing options...
ioness Posted March 30, 2016 Author Share Posted March 30, 2016 Thank's a lot for your answers. I'll try to do as you say for my next shots. And for the problem with my displacement, it doesn't seem to be solved I found an alternative by rendering using Clarisse my ground with the displaced, and it worked. Quote Link to comment Share on other sites More sharing options...
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