2 options left: Create a geo plane and apply the particle_density shader as input for a gradient mixer. Pick the volume on one of the form the particle_density tabs. Plug the gradient mixer directly into the surface. This should give you a cut of the volume (Do not hide the particle render for this test). This way you can test if the particles are actually there and if just the BBox is wrong. Then create your own box as bounding box with a transparent constant shader and the volume shader. 2 Option would be to export the particle position into a cache file. (probably position only as you have a lot of particles, perhaps velocity as you can then set the particle shader to align on velocity and make the particles elliptical) Convert them with cachefile_converter and load them with the baSICacheLoader object. Apply a phong shader and check if the BBox is now right. Hint: If you need a bit more detail, use the baFractal4D, set to colored and plug it into the distort of the volume shader. I have even made a test some time ago to use a second particle anim with huge particles and that shader with the same motion as the small ones. So your distortion moves with the particles. I have no video, but this one shows what a distortion can do: https://vimeo.com/29272120 Holger Schönberger technical director The day has 24 hours, if that does not suffice, I will take the night
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Sven Constable Sent: Friday, November 18, 2016 8:37 PM To: [email protected] Subject: RE: Particle volume rendering problem sorry, broken links http://www.imagefront.de/tmp/correct_frame.JPG http://www.imagefront.de/tmp/problem_frame.JPG http://www.imagefront.de/tmp/problem_frame_w_phong.JPG From: [email protected] [mailto:[email protected]] On Behalf Of Sven Constable Sent: Friday, November 18, 2016 8:33 PM To: [email protected] Subject: RE: Particle volume rendering problem Did some more tests and it looks like it's not even the shader. Problem accours also with a standard phong. Interestingly the shape of the cloud changes(!) when rendered with a phong shader. some pics: http://www.imagefront.de/tmp/correct_frame.JPG <http://www.imagefront.de/tmp/steam_BTY.mp4> http://www.imagefront.de/tmp/problem_frame.JPG <http://www.imagefront.de/tmp/steam_BTY.mp4> http://www.imagefront.de/tmp/problem_frame_w_phong.JPG <http://www.imagefront.de/tmp/steam_BTY.mp4> Maybe I'll check with another renderer when I have time. sven From: [email protected] [mailto:[email protected]] On Behalf Of Schoenberger Sent: Friday, November 18, 2016 11:32 AM To: [email protected] Subject: RE: Particle volume rendering problem Please reduce the lookup table size of the shader. See "Lookup Table" and "Setting up Lookup table": http://softimage.wiki.softimage.com/xsidocs/particles_shaders_ParticleVolumeICE.htm Holger Schönberger technical director The day has 24 hours, if that does not suffice, I will take the night _____ From: [email protected] [mailto:[email protected]] On Behalf Of Sven Constable Sent: Friday, November 18, 2016 1:57 AM To: [email protected] Subject: Particle volume rendering problem Hey list, I did some tests for an upcoming project and rendering doesn't work as expected. Just basic ICE particles with built-in nodes and some deformers on the pointcloud. Rendered with mental ray. As you can see in the vid, there are render problems. Sometimes it looks like missing tiles in the rendering but mostly it seems to be missing particles in the cloud itself. In this video there are all missing at the bottom but in other tests it happened also at the top and sometime at the sides of the point cloud. Never inside the cloud. And it only happens at render time. No particles are missing in the viewport. http://www.imagefront.de/tmp/steam_BTY.mp4 What I tried so far: Eliminated render farm problems: Rendered it locally on the workstation. Possible caching problem? Rendered it on a workstation on the fly without any caching. Tried playback caching as well as the manual 'write cache' via the cache manager. (unlikely since it also happens with no caching at all) Put the point cloud to global zero with no offsets in SRT. Changed most of the MR render settings. Including switching to BSP1. Disabled On Disk Framebuffer. Changed settings of the volume shader ( specially the bounding box size for the voxel computation. Set it to manual instead of Auto because the missing parts always appeared at the perimeter of the cloud). I also changed most of the other settings that possibly could have an effect. Tried both built-in particle volume shaders, 'Particle Volume Cloud' and the basic 'Particle Renderer'. (btw. the volume cloud shader by Holger Schoenberger is amazing) However, it gave me the same problems. Reduzed the particle rate (this is the video showing different particle counts but it happens in all versions as you can see). I'm pretty much out of ideas. Anyone? Thanks, sven
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