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| import Base from '../core/Base';
import Ray from '../math/Ray';
import Vector2 from '../math/Vector2';
import Vector3 from '../math/Vector3';
import Matrix4 from '../math/Matrix4';
import Renderable from '../Renderable';
import glenum from '../core/glenum';
import glmatrix from '../dep/glmatrix';
var vec3 = glmatrix.vec3;
/**
* @constructor clay.picking.RayPicking
* @extends clay.core.Base
*/
var RayPicking = Base.extend(
/** @lends clay.picking.RayPicking# */
{
/**
* Target scene
* @type {clay.Scene}
*/
scene: null,
/**
* Target camera
* @type {clay.Camera}
*/
camera: null,
/**
* Target renderer
* @type {clay.Renderer}
*/
renderer: null
}, function () {
this._ray = new Ray();
this._ndc = new Vector2();
},
/** @lends clay.picking.RayPicking.prototype */
{
/**
* Pick the nearest intersection object in the scene
* @param {number} x Mouse position x
* @param {number} y Mouse position y
* @param {boolean} [forcePickAll=false] ignore ignorePicking
* @return {clay.picking.RayPicking~Intersection}
*/
pick: function (x, y, forcePickAll) {
var out = this.pickAll(x, y, [], forcePickAll);
return out[0] || null;
},
/**
* Pick all intersection objects, wich will be sorted from near to far
* @param {number} x Mouse position x
* @param {number} y Mouse position y
* @param {Array} [output]
* @param {boolean} [forcePickAll=false] ignore ignorePicking
* @return {Array.<clay.picking.RayPicking~Intersection>}
*/
pickAll: function (x, y, output, forcePickAll) {
this.renderer.screenToNDC(x, y, this._ndc);
this.camera.castRay(this._ndc, this._ray);
output = output || [];
this._intersectNode(this.scene, output, forcePickAll || false);
output.sort(this._intersectionCompareFunc);
return output;
},
_intersectNode: function (node, out, forcePickAll) {
if ((node instanceof Renderable) && node.isRenderable()) {
if ((!node.ignorePicking || forcePickAll)
&& (
// Only triangle mesh support ray picking
(node.mode === glenum.TRIANGLES && node.geometry.isUseIndices())
// Or if geometry has it's own pickByRay, pick, implementation
|| node.geometry.pickByRay
|| node.geometry.pick
)
) {
this._intersectRenderable(node, out);
}
}
for (var i = 0; i < node._children.length; i++) {
this._intersectNode(node._children[i], out, forcePickAll);
}
},
_intersectRenderable: (function () {
var v1 = new Vector3();
var v2 = new Vector3();
var v3 = new Vector3();
var ray = new Ray();
var worldInverse = new Matrix4();
return function (renderable, out) {
var isSkinnedMesh = renderable.isSkinnedMesh();
ray.copy(this._ray);
Matrix4.invert(worldInverse, renderable.worldTransform);
// Skinned mesh will ignore the world transform.
if (!isSkinnedMesh) {
ray.applyTransform(worldInverse);
}
var geometry = renderable.geometry;
// Ignore bounding box of skinned mesh?
if (!isSkinnedMesh) {
if (geometry.boundingBox) {
if (!ray.intersectBoundingBox(geometry.boundingBox)) {
return;
}
}
}
// Use user defined picking algorithm
if (geometry.pick) {
geometry.pick(
this._ndc.x, this._ndc.y,
this.renderer,
this.camera,
renderable, out
);
return;
}
// Use user defined ray picking algorithm
else if (geometry.pickByRay) {
geometry.pickByRay(ray, renderable, out);
return;
}
var cullBack = (renderable.cullFace === glenum.BACK && renderable.frontFace === glenum.CCW)
|| (renderable.cullFace === glenum.FRONT && renderable.frontFace === glenum.CW);
var point;
var indices = geometry.indices;
var positionAttr = geometry.attributes.position;
var weightAttr = geometry.attributes.weight;
var jointAttr = geometry.attributes.joint;
var skinMatricesArray;
var skinMatrices = [];
// Check if valid.
if (!positionAttr || !positionAttr.value || !indices) {
return;
}
if (isSkinnedMesh) {
skinMatricesArray = renderable.skeleton.getSubSkinMatrices(renderable.__uid__, renderable.joints);
for (var i = 0; i < renderable.joints.length; i++) {
skinMatrices[i] = skinMatrices[i] || [];
for (var k = 0; k < 16; k++) {
skinMatrices[i][k] = skinMatricesArray[i * 16 + k];
}
}
var pos = [];
var weight = [];
var joint = [];
var skinnedPos = [];
var tmp = [];
var skinnedPositionAttr = geometry.attributes.skinnedPosition;
if (!skinnedPositionAttr || !skinnedPositionAttr.value) {
geometry.createAttribute('skinnedPosition', 'f', 3);
skinnedPositionAttr = geometry.attributes.skinnedPosition;
skinnedPositionAttr.init(geometry.vertexCount);
}
for (var i = 0; i < geometry.vertexCount; i++) {
positionAttr.get(i, pos);
weightAttr.get(i, weight);
jointAttr.get(i, joint);
weight[3] = 1 - weight[0] - weight[1] - weight[2];
vec3.set(skinnedPos, 0, 0, 0);
for (var k = 0; k < 4; k++) {
if (joint[k] >= 0 && weight[k] > 1e-4) {
vec3.transformMat4(tmp, pos, skinMatrices[joint[k]]);
vec3.scaleAndAdd(skinnedPos, skinnedPos, tmp, weight[k]);
}
}
skinnedPositionAttr.set(i, skinnedPos);
}
}
for (var i = 0; i < indices.length; i += 3) {
var i1 = indices[i];
var i2 = indices[i + 1];
var i3 = indices[i + 2];
var finalPosAttr = isSkinnedMesh
? geometry.attributes.skinnedPosition
: positionAttr;
finalPosAttr.get(i1, v1.array);
finalPosAttr.get(i2, v2.array);
finalPosAttr.get(i3, v3.array);
if (cullBack) {
point = ray.intersectTriangle(v1, v2, v3, renderable.culling);
}
else {
point = ray.intersectTriangle(v1, v3, v2, renderable.culling);
}
if (point) {
var pointW = new Vector3();
if (!isSkinnedMesh) {
Vector3.transformMat4(pointW, point, renderable.worldTransform);
}
else {
// TODO point maybe not right.
Vector3.copy(pointW, point);
}
out.push(new RayPicking.Intersection(
point, pointW, renderable, [i1, i2, i3], i / 3,
Vector3.dist(pointW, this._ray.origin)
));
}
}
};
})(),
_intersectionCompareFunc: function (a, b) {
return a.distance - b.distance;
}
});
/**
* @constructor clay.picking.RayPicking~Intersection
* @param {clay.Vector3} point
* @param {clay.Vector3} pointWorld
* @param {clay.Node} target
* @param {Array.<number>} triangle
* @param {number} triangleIndex
* @param {number} distance
*/
RayPicking.Intersection = function (point, pointWorld, target, triangle, triangleIndex, distance) {
/**
* Intersection point in local transform coordinates
* @type {clay.Vector3}
*/
this.point = point;
/**
* Intersection point in world transform coordinates
* @type {clay.Vector3}
*/
this.pointWorld = pointWorld;
/**
* Intersection scene node
* @type {clay.Node}
*/
this.target = target;
/**
* Intersection triangle, which is an array of vertex index
* @type {Array.<number>}
*/
this.triangle = triangle;
/**
* Index of intersection triangle.
*/
this.triangleIndex = triangleIndex;
/**
* Distance from intersection point to ray origin
* @type {number}
*/
this.distance = distance;
};
export default RayPicking;
|