I am creating a muscle sim for a cow. In the tissue creating phase I am having trouble with the proper attachment places of the tissue. When I visualize the attachment in the Tissue Solver I can also see the connecting line in places that should not have attachment. how can you control the attachment in the tissue? Perhaps setting the distance or painting maps? In the images I am showing what i mean.
Hi Ritchy You'll need to paint a mask for the area, and use the mask with a TissueProperties node. In the TissueProperties node, set the Surface and Solid Layer Attach Stiffness values to zero. You should also probably set the Sliding Limit Stiffness to zero to have the tissue completely detached.
Future versions of TissueProperties may include parameters that would cull attach costraints that exceed a maximum distance. But for now, you'll have to rely on zero stiffness attachments.
Also: Looking at your screen captures, it looks like the tissue and muscle geometries are not aligned. ie, I would expect to *not* see any muscle geometry poking through to the outside of the tissue. You might need to look at your tpose positions and make sure the muscles and bone are situated within the tissue.
Note that constraints are built with your tissue and muscles and bones all positioned according to their tpose. Once the constraints are established they are the transformed to your start frame.
john mariella Senior Technical Director SideFX www.sidefx.com
Thank you very much for the help. I 'll try that right away. as for the for the tissue muscle alignment. I noticed that tissuesolidify node created this geo that intersected with the muscles. I think need to tweak those values a bit more. I attached a little WIP movie of what i am working on. Its a running cow, the belly is still far to jiggly.
On TissueSolidify, use the Outliers Visualization Guide to help with setting the layer depth correctly. Or at least to highlight where problem areas exist. This may be a case of having the Surface Offset value pushing the outer surface of the tissue into the muscles.
john mariella Senior Technical Director SideFX www.sidefx.com
johm Also: Looking at your screen captures, it looks like the tissue and muscle geometries are not aligned. ie, I would expect to *not* see any muscle geometry poking through to the outside of the tissue. You might need to look at your tpose positions and make sure the muscles and bone are situated within the tissue.
Note that constraints are built with your tissue and muscles and bones all positioned according to their tpose. Once the constraints are established they are the transformed to your start frame.
Regarding the core geo, is it necessary for the core to fully encapsulate the muscle and bones?
