btShapeCreate.js

import ammoTmp from 'dvijcock/ammoTmp.js';

export default function(objThree){
	if(objThree?.dcData?.physicsShape === true){
		if(objThree.geometry.type === 'SphereGeometry'){
			objThree.dcData.btShape = new Ammo.btSphereShape(objThree.scale.x);
		}else if(objThree.geometry.type === 'BoxGeometry'){
			objThree.dcData.btShape = new Ammo.btBoxShape(
				ammoTmp.vec(objThree.scale.x*0.5, objThree.scale.y*0.5, objThree.scale.z*0.5)
			);
		}else if(objThree.geometry.type === 'CylinderGeometry'){
			objThree.dcData.btShape = new Ammo.btCylinderShape(
				ammoTmp.vec(objThree.scale.x, objThree.scale.y*0.5, objThree.scale.z)
			);
		}else if(objThree.geometry.type === 'CapsuleGeometry'){
			objThree.dcData.btShape = new Ammo.btCapsuleShape(objThree.geometry.parameters.radius,
				objThree.geometry.parameters.length);
		}else{
			console.error("Dvijcock error: uncnown physicsShape in dcData")
		}
	}else if(objThree.userData.physicsShape){
		let physicsShape = objThree.userData.physicsShape;
		if(!objThree.dcData)objThree.dcData={};
		if(!objThree.dcData.mass)objThree.dcData.mass = objThree.userData.mass;
		if(objThree.userData.kinematic)objThree.dcData.kinematic = true;
		if(physicsShape === true && (objThree.name.includes("Sphere") || objThree.name.includes("Icosphere"))){
			objThree.dcData.btShape = new Ammo.btSphereShape(objThree.scale.x);
		}else if(physicsShape === true && objThree.name.includes("Cube")){
			objThree.dcData.btShape = new Ammo.btBoxShape(
				ammoTmp.vec(objThree.scale.x, objThree.scale.y, objThree.scale.z)
			);
		}else if(typeof physicsShape == "string" && physicsShape.includes("Cube")){
			let regResult = physicsShape.match(/Cube ([0-9\.]+) ([0-9\.]+) ([0-9\.]+)/);
			if(!regResult)console.error("Dvijcock error: wrong Cylinder shape fromat");
			let x = parseFloat(regResult[1]);
			let y = parseFloat(regResult[2]);
			let z = parseFloat(regResult[3]);
			objThree.dcData.btShape = new Ammo.btBoxShape(ammoTmp.vec(x, y, z));
		}else if(physicsShape === true && objThree.name.includes("Cylinder")){
			objThree.dcData.btShape = new Ammo.btCylinderShape(
				ammoTmp.vec(objThree.scale.x, objThree.scale.y, objThree.scale.z)
			);
		}else if(typeof physicsShape == "string" && physicsShape.includes("Cylinder")){
			let regResult = physicsShape.match(/Cylinder ([0-9\.]+) ([0-9\.]+) ([0-9\.]+)/);
			if(!regResult)console.error("Dvijcock error: wrong Cylinder shape fromat");
			let x = parseFloat(regResult[1]);
			let y = parseFloat(regResult[2]);
			let z = parseFloat(regResult[3]);
			objThree.dcData.btShape = new Ammo.btCylinderShape(ammoTmp.vec(x, y, z));
		}else if(typeof physicsShape == "string" && physicsShape.includes("Capsule")){
			let regResult = physicsShape.match(/Capsule ([0-9\.]+) ([0-9\.]+)/);
			if(!regResult)console.error("Dvijcock error: wrong Capsule shape fromat");
			let radius = parseFloat(regResult[1]);
			let height = parseFloat(regResult[2]) - radius*2;
			objThree.dcData.btShape = new Ammo.btCapsuleShape(radius, height);
		}else if(physicsShape == "ConvexHull" || (physicsShape === true && objThree.dcData.mass)){
			let vert = objThree.geometry.attributes.position.array;
			const shape = new Ammo.btConvexHullShape();
			for (let i = 0; i < vert.length; i += 3) {
				let tmpVec = ammoTmp.vec(vert[i], vert[i+1], vert[i+2]);
				const lastOne = ( i >= (vert.length-3) );
				shape.addPoint( tmpVec, lastOne );
			}
			objThree.dcData.btShape = shape;
		}else if(physicsShape == "TriangleMesh" || (physicsShape === true && !objThree.dcData.mass)){
			var mesh = new Ammo.btTriangleMesh(true, true);
			let index = objThree.geometry.index.array;
			let vert = objThree.geometry.attributes.position.array;
			for (let i = 0; i < index.length; i+=3){
				ammoTmp.vecArr[0].setValue(vert[index[i+0]*3+0], vert[index[i+0]*3+1], vert[index[i+0]*3+2]);
				ammoTmp.vecArr[1].setValue(vert[index[i+1]*3+0], vert[index[i+1]*3+1], vert[index[i+1]*3+2]);
				ammoTmp.vecArr[2].setValue(vert[index[i+2]*3+0], vert[index[i+2]*3+1], vert[index[i+2]*3+2]);
				mesh.addTriangle(ammoTmp.vecArr[0], ammoTmp.vecArr[1], ammoTmp.vecArr[2], false); 
			}
			objThree.dcData.btShape = new Ammo.btBvhTriangleMeshShape(mesh, true, true);
			objThree.dcData.btTriangleMesh = mesh;
		}else{
			console.error("Dvijcock error: uncnown physicsShape in userData")
		}
	}
}