I am making an animation where the character is shimming across a ledge, and the ledge starts to crumble. I would have to delete faces of the ledge to make them crumble. How can I do that?
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Try looking at the answers on this question and see if they help: http://blender.stackexchange.com/questions/3337/procedurally-generating-wear-on-an-object If not, leave a comment asking for more help. – Thom Blair III Apr 06 '14 at 17:15
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You can also try this: http://blender.stackexchange.com/questions/3370/is-it-possible-to-generate-an-image-based-on-edges-and-corners but I'm not sure if it's what you're looking for. – Thom Blair III Apr 06 '14 at 17:15
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You could use a Mask modifier if you really want to delete certain faces on a certain frame, however I'm not sure this is really what you want to do.
Mask modifier:
If you really want to delete a specific face (or faces) on a certain frame, then you can use the Mask modifier.
Select the faces you want to hide and assign them to a vertex group in Properties > Object data > Vertex groups
Add a mask modifier and select your vertex group and enable Invert by clicking the button next to the vertex group selector:
Keyframe the visibility of the modifier by hovering over the eye icon and pressing I.
If you want more variation, try using a reversed Build modifier. This will delete all faces in the object over time, either randomly or in order.
Fracturing:
If you are trying to make a more complex/realistic You might also want to try the Cell fracture addon (see this post):
Or the explode modifier.
Timaroberts
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gandalf3
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3All faces touching a vertex assigned to the Vertex Group also disappear. To get just a single face to disappear, select that face in Edit Mode, then go to
Mesh>Faces>Poke Faces, and only assign the new vertex at the center of the poked face to the Vertex Group. – Garrett Apr 06 '14 at 21:12