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isah_voodoo

vdb vel combine

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Hello,

I am creating a couple of  volumes with the vdb from particles node and I realized that I have no idea how to combine my velocity fields into one. I am trying to use the VDB combine and VDB vector merge . But it is not working. When I visualize my velocity field. It doesn't look right. Someone please help. 

vdb_velocity_combine.hip

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Posted (edited)

Hi, you should just use VDB combine and not VDB vector merge. Just plug two volumes at the time in the input A and B , then switch Operation to "Add"

 

VDB vector merge is for merging vector volumes that have been split for some reasons, for example when you have 3 volumes that are named @vel.x, @vel.y, @vel.z

Edited by Andrea Sbabo

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Posted (edited)

What you are doing wrong is how you connect the two inputs. Apparently is not possible to connect both the A input and B input to the same merge node. The node than don#t know anymore what is what. Also you don't need to specify Group A and Group B

 

vdb_velocity_combine2_fix.hip

Edited by Andrea

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