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| import Mesh from '../Mesh';
import Geometry from '../Geometry';
import Plane from '../math/Plane';
import Vector3 from '../math/Vector3';
import Matrix4 from '../math/Matrix4';
import Ray from '../math/Ray';
import glMatrix from '../dep/glmatrix';
var mat4 = glMatrix.mat4;
var vec3 = glMatrix.vec3;
var vec4 = glMatrix.vec4;
var uvs = [[0, 0], [0, 1], [1, 1], [1, 0]];
var tris = [0, 1, 2, 2, 3, 0];
var InfinitePlane = Mesh.extend({
camera: null,
plane: null,
maxGrid: 0,
// TODO
frustumCulling: false
}, function () {
var geometry = this.geometry = new Geometry({
dynamic: true
});
geometry.attributes.position.init(6);
geometry.attributes.normal.init(6);
geometry.attributes.texcoord0.init(6);
geometry.indices = new Uint16Array(6);
this.plane = new Plane();
}, {
updateGeometry: function () {
var coords = this._unProjectGrid();
if (!coords) {
return;
}
var positionAttr = this.geometry.attributes.position;
var normalAttr = this.geometry.attributes.normal;
var texcoords = this.geometry.attributes.texcoord0;
var indices = this.geometry.indices;
for (var i = 0; i < 6; i++) {
var idx = tris[i];
positionAttr.set(i, coords[idx].array);
normalAttr.set(i, this.plane.normal.array);
texcoords.set(i, uvs[idx]);
indices[i] = i;
}
this.geometry.dirty();
},
// http://fileadmin.cs.lth.se/graphics/theses/projects/projgrid/
_unProjectGrid: (function () {
var planeViewSpace = new Plane();
var lines = [
0, 1, 0, 2, 1, 3, 2, 3,
4, 5, 4, 6, 5, 7, 6, 7,
0, 4, 1, 5, 2, 6, 3, 7
];
var start = new Vector3();
var end = new Vector3();
var points = [];
// 1----2
// | |
// 0----3
var coords = [];
for (var i = 0; i < 4; i++) {
coords[i] = new Vector3(0, 0);
}
var ray = new Ray();
return function () {
planeViewSpace.copy(this.plane);
planeViewSpace.applyTransform(this.camera.viewMatrix);
var frustumVertices = this.camera.frustum.vertices;
var nPoints = 0;
// Intersect with lines of frustum
for (var i = 0; i < 12; i++) {
start.array = frustumVertices[lines[i * 2]];
end.array = frustumVertices[lines[i * 2 + 1]];
var point = planeViewSpace.intersectLine(start, end, points[nPoints]);
if (point) {
if (!points[nPoints]) {
points[nPoints] = point;
}
nPoints++;
}
}
if (nPoints === 0) {
return;
}
for (var i = 0; i < nPoints; i++) {
points[i].applyProjection(this.camera.projectionMatrix);
}
var minX = points[0].array[0];
var minY = points[0].array[1];
var maxX = points[0].array[0];
var maxY = points[0].array[1];
for (var i = 1; i < nPoints; i++) {
maxX = Math.max(maxX, points[i].array[0]);
maxY = Math.max(maxY, points[i].array[1]);
minX = Math.min(minX, points[i].array[0]);
minY = Math.min(minY, points[i].array[1]);
}
if (minX == maxX || minY == maxY) {
return;
}
coords[0].array[0] = minX;
coords[0].array[1] = minY;
coords[1].array[0] = minX;
coords[1].array[1] = maxY;
coords[2].array[0] = maxX;
coords[2].array[1] = maxY;
coords[3].array[0] = maxX;
coords[3].array[1] = minY;
for (var i = 0; i < 4; i++) {
this.camera.castRay(coords[i], ray);
ray.intersectPlane(this.plane, coords[i]);
}
return coords;
};
})()
});
export default InfinitePlane;
|