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Enable static-body on ground with a Heightfield shape (wip) #24

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Enable static-body on ground with a Heightfield shape (wip) #24

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54 changes: 53 additions & 1 deletion index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,15 @@ AFRAME.registerComponent('environment', {
this.dressing = document.createElement('a-entity');
this.dressing.classList.add('environmentDressing');

// add static-body component to the ground if physics available
const physicsAvail = !!this.el.sceneEl.getAttribute('physics');
if (physicsAvail) {
this.ground.setAttribute('static-body', 'shape', 'none');
// Specifying hull as shape works but is slow. We create
// a Heightfield shape at the same time as modifying the plane
// geometry and attach it to the body.
}

this.gridCanvas = null;
this.gridTexture = null;

Expand Down Expand Up @@ -463,14 +472,26 @@ AFRAME.registerComponent('environment', {
return;
}

var segments = resolution - 1;
var planeSize = this.STAGE_SIZE + 2;
var planeSizeHalf = planeSize / 2;
var segmentSize = planeSize / segments;
if (!this.groundGeometry) {
this.groundGeometry = new THREE.PlaneGeometry(this.STAGE_SIZE + 2, this.STAGE_SIZE + 2, resolution - 1, resolution - 1);
this.groundGeometry = new THREE.PlaneGeometry(planeSize, planeSize, segments, segments);
}
var perlin = new PerlinNoise();
var verts = this.groundGeometry.vertices;
var numVerts = this.groundGeometry.vertices.length;
var frequency = 10;
var inc = frequency / resolution;
var physicsAvail = !!this.el.sceneEl.getAttribute('physics');
if (physicsAvail) {
var maxH = 0;
var matrix = [];
for (var j = 0; j < resolution; j++) {
matrix.push(new Float32Array(resolution));
}
}

for (var i = 0, x = 0, y = 0; i < numVerts; i++) {
if (this.data.ground == 'flat') {
Expand Down Expand Up @@ -512,6 +533,16 @@ AFRAME.registerComponent('environment', {
// set height
verts[i].z = h;

// construct matrix to create the Heightfield
if (physicsAvail) {
// We reverse the calculation that is done when creating the
// PlaneGeometry to get back the original x and y for the matrix.
matrix[Math.round((verts[i].x + planeSizeHalf) / segmentSize)][Math.round((verts[i].y + planeSizeHalf) / segmentSize)] = h * this.data.groundYScale;
if (h > maxH) {
maxH = h;
}
}

// calculate next x,y ground coordinates
x += inc;
if (x >= 10) {
Expand All @@ -520,6 +551,27 @@ AFRAME.registerComponent('environment', {
}
}


if (physicsAvail) {
// Create the heightfield
var hfShape = new CANNON.Heightfield(matrix, {
elementSize: segmentSize,
minValue: 0,
maxValue: maxH * this.data.groundYScale
});
hfShape.offset = new THREE.Vector3(-planeSize / 2, -planeSize / 2, 0);
this.ground.addEventListener('body-loaded', () => {
this.ground.body.addShape(hfShape, hfShape.offset, hfShape.orientation);
// Show wireframe
if (this.el.sceneEl.systems.physics.debug) {
var bodyComponent = this.ground.components['static-body'];
var createWireframe = bodyComponent.createWireframe.bind(bodyComponent);
createWireframe(this.ground.body, hfShape);
this.el.sceneEl.object3D.add(bodyComponent.wireframe);
}
});
}

this.groundGeometry.computeFaceNormals();
if (this.data.flatShading) {
this.groundGeometry.computeFlatVertexNormals();
Expand Down