Particles to Rigid Bodies V1.1

//Creates rigid bodies inheritting initial per particle position and velocity
//Assign as creation expression to "nParticleShape1" system or use shelf button to automatically
//Playback once to generate rigid bodies, then disable particle evaluation to avoid generating additional rigid bodies on playback
//After making changes to the particle emitter, delete any objects generated by expression before playing back again
//Use emmitter max and min distance attributes or volume emitter type to avoid rigid bodies interpenetrating upon generation,
//To use expression with other particle systems change any instances of "nParticleShape1" in the expression
//		Paste expression into script editor and use 'CTRL + F' for search and replace feature
//If maya crashes upon playback, lower emission rate
//		If crashes persist, create rigid body manually and set playbacks start time to frame 0 before creating expression
//Check expression for additional instructions and settings

//  -Shelf Button Mel-
//dynExpression -s "" -c nParticleShape1;
//dynExpression -s "if (1==1) {\nstring $pTarget = \"pCube\";\n\nduplicate $pTarget;\nfloat $randRotateX = rand(-720,720);\nfloat $randRotateY = rand(-720,720);\nfloat $randRotateZ = rand(-720,720);\n\nvector $particlePosition = nParticleShape1.position;\nfloat $particlePositionX = $particlePosition.x;\nfloat $particlePositionY = $particlePosition.y;\nfloat $particlePositionZ = $particlePosition.z;\nsetAttr (($pTarget) + (nParticleShape1.particleId + 1) + \".translateX\") $particlePositionX;\nsetAttr (($pTarget) + (nParticleShape1.particleId + 1) + \".translateY\") $particlePositionY;\nsetAttr (($pTarget) + (nParticleShape1.particleId + 1) + \".translateZ\") $particlePositionZ;\nsetAttr (($pTarget) + (nParticleShape1.particleId + 1) + \".rotateX\") $randRotateX;\nsetAttr (($pTarget) + (nParticleShape1.particleId + 1) + \".rotateY\") $randRotateY;\nsetAttr (($pTarget) + (nParticleShape1.particleId + 1) + \".rotateZ\") $randRotateZ;\n\nrigidBody -n (\"ParticleToRigid\" + (nParticleShape1.particleId + 1)) -active ($pTarget + (nParticleShape1.particleId + 1));\n\nvector $particleVelocity = nParticleShape1.velocity;\nfloat $particleVelocityX = $particleVelocity.x;\nfloat $particleVelocityY = $particleVelocity.y;\nfloat $particleVelocityZ = $particleVelocity.z;\nsetAttr (\"ParticleToRigid\" + (nParticleShape1.particleId + 1) + \".initialVelocityX\") $particleVelocityX;\nsetAttr (\"ParticleToRigid\" + (nParticleShape1.particleId + 1) + \".initialVelocityY\") $particleVelocityY;\nsetAttr (\"ParticleToRigid\" + (nParticleShape1.particleId + 1) + \".initialVelocityZ\") $particleVelocityZ;\nsetAttr (\"ParticleToRigid\" + (nParticleShape1.particleId + 1) + \".initialSpinX\") $randRotateX;\nsetAttr (\"ParticleToRigid\" + (nParticleShape1.particleId + 1) + \".initialSpinY\") $randRotateY;\nsetAttr (\"ParticleToRigid\" + (nParticleShape1.particleId + 1) + \".initialSpinZ\") $randRotateZ;\n\nselect (($pTarget) + (nParticleShape1.particleId + 1));\nsetKeyframe -at ignore;\nsetKeyframe -at visibility;\nsetKeyframe -v 1 -t (frame - 1) -at ignore;\nsetKeyframe -v 0 -t (frame - 1) -at visibility;\n\nnParticleShape1.lifespanPP = 0;\n\n\t}" -c nParticleShape1;


//Enable or disable script
if (1==1) {

//Change "pCube" to the name of the target object (can't end with number)
string $pTarget = "pCube";

//Initial rotation speed
float $randRotateX = rand(-720,720);
float $randRotateY = rand(-720,720);
float $randRotateZ = rand(-720,720);

duplicate $pTarget;

vector $particlePosition = nParticleShape1.position;
float $particlePositionX = $particlePosition.x;
float $particlePositionY = $particlePosition.y;
float $particlePositionZ = $particlePosition.z;
setAttr (($pTarget) + (nParticleShape1.particleId + 1) + ".translateX") $particlePositionX;
setAttr (($pTarget) + (nParticleShape1.particleId + 1) + ".translateY") $particlePositionY;
setAttr (($pTarget) + (nParticleShape1.particleId + 1) + ".translateZ") $particlePositionZ;
setAttr (($pTarget) + (nParticleShape1.particleId + 1) + ".rotateX") $randRotateX;
setAttr (($pTarget) + (nParticleShape1.particleId + 1) + ".rotateY") $randRotateY;
setAttr (($pTarget) + (nParticleShape1.particleId + 1) + ".rotateZ") $randRotateZ;

rigidBody -n ("ParticleToRigid" + (nParticleShape1.particleId + 1)) -active ($pTarget + (nParticleShape1.particleId + 1));

vector $particleVelocity = nParticleShape1.velocity;
float $particleVelocityX = $particleVelocity.x;
float $particleVelocityY = $particleVelocity.y;
float $particleVelocityZ = $particleVelocity.z;
setAttr ("ParticleToRigid" + (nParticleShape1.particleId + 1) + ".initialVelocityX") $particleVelocityX;
setAttr ("ParticleToRigid" + (nParticleShape1.particleId + 1) + ".initialVelocityY") $particleVelocityY;
setAttr ("ParticleToRigid" + (nParticleShape1.particleId + 1) + ".initialVelocityZ") $particleVelocityZ;
setAttr ("ParticleToRigid" + (nParticleShape1.particleId + 1) + ".initialSpinX") $randRotateX;
setAttr ("ParticleToRigid" + (nParticleShape1.particleId + 1) + ".initialSpinY") $randRotateY;
setAttr ("ParticleToRigid" + (nParticleShape1.particleId + 1) + ".initialSpinZ") $randRotateZ;

select (($pTarget) + (nParticleShape1.particleId + 1));
setKeyframe -at ignore;
setKeyframe -at visibility;
setKeyframe -v 1 -t (frame - 1) -at ignore;
setKeyframe -v 0 -t (frame - 1) -at visibility;

//Kills particle after rigid body is created
nParticleShape1.lifespanPP = 0;

	}