Remove vertices based on texture

Question

Is there a way to apply a black and white texture to a object and remove all vertices mapped to a point where the texture is black?

I want to build a hollow earth globe and remove all vertices where there is land.

Do you want to actually remove the vertices from the mesh or just hide them so they won't be rendered? — wchargin, Aug 08 '13 at 16:06
I want to actually remove them, because it's supposed to be 3d printed. — Beothorn, Aug 08 '13 at 16:07

score 8 · Accepted Answer · edited Aug 08 '13 at 18:52

8

Create a Vertex Group.
Add a Vertex Weight Mix modifier.
- Set Vertex Group A to the one created in the previous step.
- Set Default Weight B to 1.
- Set Mix Set to All.
- Add your texture to Texture Mask and set Textue Coordinates.
Add a Mask modifier and set the Vertex Group.
Apply modifiers (optional).

The result

edited Aug 08 '13 at 18:52

Aldrik

answered Aug 08 '13 at 16:40

JulianHzg

I added the texture, projected the uv map and created the two vertex groups, but it still didn't work. I know it's something obvious, but I have little experience with blender. Could you please start the answer from the point you add the texture? – Beothorn Aug 08 '13 at 17:26
2

Possible problems: a) Have you added the vertices of your object to the vertex groups with the correct values? To do that, go into Edit-mode, select everything, go to one of the vertex groups, set the Weight slider below to 0/1 depending on the group, and then click "Assign". b) Do both modifiers look just like above? – JulianHzg Aug 08 '13 at 17:30
I know the texture is correct (or half correct) because on the 3d view the texture is showing it, but when I render it doesn't. Also the vertex are right because I can select them with the select button. – Beothorn Aug 08 '13 at 17:30
1

For the Texture in the Modifier, click Texture Mask: + New, then click on the very right button that appeared (mouseover description: "Show texture in texture tab"), there, set "Type" to "Image or Movie" and open the correct image in the "Image" area below. – JulianHzg Aug 08 '13 at 17:33
let us continue this discussion in chat – Beothorn Aug 08 '13 at 17:35
Thanks, it worked. I didn't assigne the weights, and I tried to change them by selecting the vertex group and sliding the weight. I had to assign the groups again with the correct weight. Thanks!! – Beothorn Aug 08 '13 at 17:38

1 Answers1