jim c Posted February 21, 2015 Share Posted February 21, 2015 I'm trying to get my surface to shatter along am animated trail. I'm using a sphere animated along a curve to push up the shattered parts, and then a deforming terrain object that "catches" the broken pieces. See 1st attached image. The first 18 frames work perfectly. Then all of a sudden on frame 19, all the other fracture pieces go haywire (see 2nd image). I've attached a simple test of this. Is there something obvious I'm missing? groundshatter.hipnc Quote Link to comment Share on other sites More sharing options...
rayman Posted February 21, 2015 Share Posted February 21, 2015 Check grid_object2/make_terrain node. between 18-19 frame you can see that the boundary of the object is slightly different - in combination with concave object probably this is causing instability in simulation . Right click -> Allow Editing on contents on grid_object2 node. Dive inside make terrain network, select extrude_volume1 and uncheck Flatten Base option. Now it will work much better. Good luck! Quote Link to comment Share on other sites More sharing options...
jim c Posted February 21, 2015 Author Share Posted February 21, 2015 Wow, thanks so much, works perfectly now!! I did see the change in the collision boundary, but I didn't understand why it was happening, and since it seems to just go down, I didn't think it was affecting anything. I wonder if I make the terrain a full 3d shape instead of just a plain, if it would behave nicer? Anyways, thanks a lot! Quote Link to comment Share on other sites More sharing options...
jim c Posted February 21, 2015 Author Share Posted February 21, 2015 OK one last weird issue. The shattering object seems to elevate a small amount after frame 1, and I'm not sure why. Playing with the terrain object doesn't seem to matter, and it's size doesn't seem to change either, so I don't *think* that's the issue. The shatter object has it's object level TY set to 0.12, but that's NOT key framed. It just seems to jump up a small amount and then hover there. Is that normal? Changing the rbd solver's sub steps doesn't seem to have any affect. Quote Link to comment Share on other sites More sharing options...
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