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liteng 2019-08-26 12:24:11 +08:00
parent e3f1f0583d
commit 72b0bb309a
1 changed files with 21 additions and 3 deletions
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24
ShadowEditor.Web/test/weekend/src/Application.js
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@ -71,21 +71,39 @@ Application.prototype.hitSphere = function () {
let b = temp.copy(oc).dot(r.direction) * 2;
let c = temp.copy(oc).dot(oc) - radius * radius;
let discriminant = b * b - 4 * a * c;
if (discriminant < 0) {
return -1;
} else {
return (-b - Math.sqrt(discriminant)) / (2 * a);
}
return discriminant > 0;
};
}();
Application.prototype.calculateColor = function () {
let mz = new THREE.Vector3(0, 0, -1);
let target = new THREE.Vector3();
let one = new THREE.Vector3(1, 1, 1);
return function (ray, color) {
if (this.hitSphere(mz, 0.5, ray)) {
color.setRGB(1, 0, 0);
let t = this.hitSphere(mz, 0.5, ray);
if (t > 0) {
ray.at(t, target);
let n = target.sub(mz).normalize();
let rgb = n.add(one).multiplyScalar(0.5);
color.setRGB(rgb.x, rgb.y, rgb.z);
return;
}
let direction = ray.direction;
let t = 0.5 * (direction.y + 1);
t = 0.5 * (direction.y + 1);
color.setRGB(
(1 - t) * 1 + t * 0.5,
(1 - t) * 1 + t * 0.7,