David Derwin
davidderwin
About Me
EXPERTISE
VFX Artist
INDUSTRY
Film/TV
Houdini Skills
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Recent Forum Posts
VDB remove interior Oct. 4, 2019, 5:32 p.m.
If your polygons are floating on the inside of the mesh and not connected to the outer shell another thing you can try is to convert VDB to polygons just once then plug that into the first input of a boolean sop. Leave the second input of the boolean empty. If the polys are floating on the inside that should remove them and leave just the outer mesh. Saw that on a tutorial somewhere, you can throw down test geometry rubber toy then plug it into the first input of a boolean and see what it does to the inside of the mesh.
VEX : using FOR wihtout errors but doesn't work Oct. 22, 2018, 3:10 p.m.
You're very close! Your condition in the for loop is currently i==stop, meaning the loop will run as long as i==stop returns true. When the loop starts, i=0 which is not equal to stop (in your example stop would be equal to 2 and in all cases would be greater than 0). I guess it technically isn't incorrect code is why it doesn't error out but it doesn't run as expected.
If you change your for condition to:
it will work as expected.
Full code only changing that one line:
If you change your for condition to:
for(int i=0; i<stop; i++)
it will work as expected.
Full code only changing that one line:
int stop = @numprim; for(int i=0; i<stop; i++) { vector pos = prim(0, "P", i); push(f[]@zpos, pos.z); }
edges from knife tool July 2, 2018, 3:55 p.m.
One way to do this would be:
1. make a group of all points
2. do knife operation
3. do a group combine set to group type “Points” to make a new point group, set to “Equals All But” the point group prior to knife (from step 1) (this will give you a point group with only the new points created from the knife operation).
4. do a group promote from points to edges on the group from step 3 (making sure to turn ON the toggle to “Include Only Elements Entirely Contained in Original Group”).
This will give you an edge group with just the newly created edge from the knife.
If you have a lot of knife operations and need separate groups for each new knife edge this might not be the most elegant solution but you can repeat the process as many times as needed or can insert as many knife operations after step 2 and get a single edge group from all knife operations.
1. make a group of all points
2. do knife operation
3. do a group combine set to group type “Points” to make a new point group, set to “Equals All But” the point group prior to knife (from step 1) (this will give you a point group with only the new points created from the knife operation).
4. do a group promote from points to edges on the group from step 3 (making sure to turn ON the toggle to “Include Only Elements Entirely Contained in Original Group”).
This will give you an edge group with just the newly created edge from the knife.
If you have a lot of knife operations and need separate groups for each new knife edge this might not be the most elegant solution but you can repeat the process as many times as needed or can insert as many knife operations after step 2 and get a single edge group from all knife operations.