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POCollision equation for two 3d objects
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  1. POCollision equation for two 3d objects
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    copied!<p>I'm trying a script in maya to see if i can get gravity and that lot working with spherical objects, and currently it works fine (tried making a moon and earth to scale and calibrated the gravity effect to that), but I'd like to try get it a step further and add collisions to make objects bounce off each other, but after looking around for ages yesterday, I found it's hard enough with 2d objects, never mind 3d.<br/><br/> I've managed to write a bit which can detect a collision, where it gets the distance between both objects and compares it against the radius of both objects, which seems to work (needs rewriting though), but I couldn't figure out what to do next. To be honest, I'm not even sure if it's possible to do with something like this without some advanced university knowledge which is why I eventually gave up :P<br/><br/> Just for an idea of how it works, here's the current stage of the main part - objSel[j] is the current selected object, allObjects is everything but the current selected object</p> <pre><code>def moveObjects(originalTime,objSel,objMultiplySize): moveAmounts = [] crashed = False for j in range(len(objSel)): #get initial values originalVelocity = getVelocity(objSel[j],originalTime,objMultiplySize) objVolume = getVolume(objSel[j],objMultiplySize) allObjects = selectAllOtherObjects(objSel[j], objSel) #calculate gravity effect on object xDist = 0 yDist = 0 zDist = 0 for i in range (0, len(allObjects) ): attraction = calcuateForce(objSel[j],allObjects[i],objMultiplySize) distanceFromObj = getDistance(allObjects[i],objSel[j],objMultiplySize)[1] xDist += distanceFromObj[0] * attraction / (objVolume*2.15*math.pi) yDist += distanceFromObj[1] * attraction / (objVolume*2.15*math.pi) zDist += distanceFromObj[2] * attraction / (objVolume*2.15*math.pi) gravityEffect = [xDist,yDist,zDist] newX = (originalVelocity[0]+gravityEffect[0])/objMultiplySize newY = (originalVelocity[1]+gravityEffect[1])/objMultiplySize newZ = (originalVelocity[2]+gravityEffect[2])/objMultiplySize newVelocity = [newX,newY,newZ] moveAmounts.append( newVelocity ) #-----------this whole bit needs rewriting-------- py.currentTime( originalTime + 1, edit = True, update = True) for j in range(len(moveAmounts)): #collision detection allObjects = selectAllOtherObjects(objSel[j], objSel) originalRadius = getRadius(objSel[j],objMultiplySize) for i in range (0, len(allObjects) ): objRadius = getRadius(allObjects[i],objMultiplySize) objDistance = getDistance(allObjects[i],objSel[j],objMultiplySize) if objDistance[0] &lt; objRadius + originalRadius: force1 = moveAmounts[j][0]*objMultiplySize * objRadius print "Crashed" crashed = True if crashed != True: #move object py.move( objSel[j], float(moveAmounts[j][0]), float(moveAmounts[j][1]), float(moveAmounts[j][2]), relative = True ) py.setKeyframe( objSel[j], attribute='translateX') py.setKeyframe( objSel[j], attribute='translateY') py.setKeyframe( objSel[j], attribute='translateZ') else: #dunno what to do here for i in range (0, len(allObjects) ): mass1 = getVolume(allObjects[i],objMultiplySize) velocity1 = getVelocity(allObjects[i],originalTime,objMultiplySize) mass2 = getVolume(objSel[j],objMultiplySize) velocity2 = getVelocity(objSel[j],originalTime,objMultiplySize) m1v1m2v2X = mass1*velocity1[0] + mass2*velocity2[0] m1v1m2v2Y = mass1*velocity1[1] + mass2*velocity2[1] m1v1m2v2Z = mass1*velocity1[2] + mass2*velocity2[2] totalMass = mass1+mass2 </code></pre>
 

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