agitat3d Posted April 17, 2008 Share Posted April 17, 2008 Hi to you all I have created a SDF Volume and am looking to manipulate the levelset data in order to erode the object. I cant seem to veiw any of this data so obviously modifying it is a problem. Any advice would be a big help as this is all new to me!? Big thanks in advanced! Quote Link to comment Share on other sites More sharing options...
GallenWolf Posted April 18, 2008 Share Posted April 18, 2008 What operations do you want to do on it? The volume mix sop could help you out here. GW Quote Link to comment Share on other sites More sharing options...
Jason Posted April 18, 2008 Share Posted April 18, 2008 Your friends are the IsoOffset SOP, the VolumeMix SOP and the Isosurface SOP. Just to do what you're talking about the IsoOffset can do in a single step - it'll make a levelset and mesh it in one SOP, and it exposes a parameter to erode/dilate it right there. Quote Link to comment Share on other sites More sharing options...
agitat3d Posted April 19, 2008 Author Share Posted April 19, 2008 Your friends are the IsoOffset SOP, the VolumeMix SOP and the Isosurface SOP.Just to do what you're talking about the IsoOffset can do in a single step - it'll make a levelset and mesh it in one SOP, and it exposes a parameter to erode/dilate it right there. Hi Ya and thanks for your replies, Well I had been playing with the erode and dilate params, however I found that it erodes the surface in a uniform way. I was looking to have patches of the object erode non uniformly about an arbitrary number concentric points on the surface. The erosion would eat ALONG and INTO the surface so I was looking to have some kind of access to data representing the volume. I could then manipulate the data in a flexible and efficient way to remove, translate etc parts of the volume. I have been looking at an article by sony imagework on how they eroded the sandman and wanted to utilize houdini to do a similar thing. (See attached article, section 3). I know sony developed a hell of a lot of tools to asist them in the production however I would like to see how far I can push an off the shelf copy of houdini with existing operators. Many thanks. Ferreira_Levelsets_2007.pdf Quote Link to comment Share on other sites More sharing options...
Jason Posted April 21, 2008 Share Posted April 21, 2008 I think you can hack a few of the things by adding and subtracting, max'ing and min'ing values in SDFs in the VolumeMix SOP- but I think what you might be missing are functions to filter the Volumes (blur, etc) and a function to Reinitialize SDFs in order to fix them up after a bit of hacking. Unfortunately the neat SDF tools are trapped in DOPs right now; perhaps one day they'll make those neat functions available in SOPs. Quote Link to comment Share on other sites More sharing options...
agitat3d Posted April 21, 2008 Author Share Posted April 21, 2008 I think you can hack a few of the things by adding and subtracting, max'ing and min'ing values in SDFs in the VolumeMix SOP- but I think what you might be missing are functions to filter the Volumes (blur, etc) and a function to Reinitialize SDFs in order to fix them up after a bit of hacking. Unfortunately the neat SDF tools are trapped in DOPs right now; perhaps one day they'll make those neat functions available in SOPs. Hi Jason, Thanks for your response. Yeah I had noticed that DOPs done some really koul stuff with SDF! Well thanks for he advice and ive managed to get some half decent stuff working with volumeMix. My plans are to maybe generate some curves over the surface and spawn particles over them using the vol mix to subtract their volume from the initial geo. I just need a way to generate some decent noise and irregularity. Well, we'll see what happens. Thanks again Quote Link to comment Share on other sites More sharing options...
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