cashkao Posted October 14, 2010 Share Posted October 14, 2010 Hey guys, I have two questions about the "make breakable" in Houdini 11. Q1: I put the group numbers in the impact group, however, it doesn't break at all...><, How do I make it break based on the group numbers? Q2: I would like to test an effect that a sphere will pass through two grids (also break them)...However, it also does not work like the way I want. I am just a beginner in Houdini and trying to figure these out..... Any response will be appreciated. Thank you breakThrough.hipnc impactGroup.hipnc Quote Link to comment Share on other sites More sharing options...
johner Posted October 15, 2010 Share Posted October 15, 2010 The "Impact Group" doesn't control which parts of the object can fracture; it controls which other objects can potentially cause a fracture on the object. So, for example you could specify that an object can fracture when hits the "wall" object, but not when it hits the "groundplane" object, by changing its "Impact Group" from "*" to "wall". Or you could specify "* ^groundplane" to exclude only the groundplane. As for your second example, the RBD solver and fracturing system don't really handle flat objects like your grid. It should work if you extrude those grids into a box and hold them in place somehow (or at least turn Gravity off for them). Or if you really need flat grids you might be able to use the Cloth Solver and its tearing capabilities. If you haven't seen it, there are some dynamic fracturing examples here. Quote Link to comment Share on other sites More sharing options...
cashkao Posted October 15, 2010 Author Share Posted October 15, 2010 (edited) Thank you so much Johner. I will try your suggestion and also the links. One more thing, I try to turn off the gravity but it will also effect the sphere. Is there anyway that I can exclude only the two grids, but only let the gravity to effect the sphere? Thank you for your help. ^^ Edited October 15, 2010 by cashkao Quote Link to comment Share on other sites More sharing options...
johner Posted October 15, 2010 Share Posted October 15, 2010 One more thing, I try to turn off the gravity but it will also effect the sphere. Is there anyway that I can exclude only the two grids, but only let the gravity to effect the sphere? Two ways: either change the "Group" parameter on the Gravity DOP to "sphere_object1" so it affects only the sphere, or leave the Group as "*", but move the Gravity DOP between the sphere_object1 DOP and the Merge. Quote Link to comment Share on other sites More sharing options...
cashkao Posted October 18, 2010 Author Share Posted October 18, 2010 Got it! Thank you so very very much..^^ Quote Link to comment Share on other sites More sharing options...
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