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remove decal after collision #9

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remove decal after collision #9

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37 changes: 34 additions & 3 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -78,8 +78,17 @@ export default e => {
// const debugMesh = [];
const debugDecalVertPos = false;




const maxNumDecals = 128;
const decalGeometry = new THREE.PlaneBufferGeometry(0.5, 0.5, 8, 8).toNonIndexed();

let currentDecal = 0;
let collisionTime = [];
for(let i = 0; i < maxNumDecals; i++){
collisionTime[i] = -1;
}
const _makeDecalMesh = () => {
const geometry = new THREE.BufferGeometry();
const positions = new Float32Array(decalGeometry.attributes.position.array.length * maxNumDecals);
Expand Down Expand Up @@ -219,7 +228,6 @@ export default e => {
{
const result = physics.raycast(gunApp.position, gunApp.quaternion.clone().multiply(z180Quaternion));
if (result) {

const targetApp = getAppByPhysicsId(result.objectId);

const normal = new THREE.Vector3().fromArray(result.normal);
Expand Down Expand Up @@ -324,9 +332,11 @@ export default e => {
// };
//decalMesh.geometry.index.needsUpdate = true;
// update geometry attribute offset

decalMesh.offset += localDecalGeometry.attributes.position.count;
decalMesh.offset = decalMesh.offset % decalMesh.geometry.attributes.position.count;

currentDecal++;

explosionApp.position.fromArray(result.point);
explosionApp.quaternion.setFromRotationMatrix(
new THREE.Matrix4().lookAt(
Expand Down Expand Up @@ -420,8 +430,29 @@ export default e => {
gunApp.use();
}
});

let positionAttributeLength = decalGeometry.attributes.position.array.length/3;
useFrame(({timestamp}) => {
if(currentDecal>0){
//handle if index equal -1
let index = decalMesh.offset / positionAttributeLength - 1 >= 0 ? decalMesh.offset / positionAttributeLength - 1 : maxNumDecals - 1;
if(collisionTime[index] == -1){ //means haven't recorded the collision time
collisionTime[index] = timestamp;
}
for(let i = 0; i < maxNumDecals; i++){
// if collision time larger than 1.5 sec, then clean the position attribute
if(collisionTime[i] != -1 && timestamp - collisionTime[i] > 1500){
collisionTime[i] = -1;
for(let j = 0; j < positionAttributeLength; j++)
decalMesh.geometry.attributes.position.setXYZ(i * positionAttributeLength + j, 0, 0, 0);
currentDecal--;
}
}
decalMesh.geometry.attributes.position.needsUpdate = true;
}




if (!wearing) {
if (gunApp) {
gunApp.position.copy(app.position);
Expand Down