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Copy pathSphere.java
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101 lines (86 loc) · 3.12 KB
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/*
* The MIT License
*
* Copyright 2023 akava.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package ptjava;
class Sphere extends TransformedShape {
public Vector Center;
public double Radius;
Material Material;
Box Box;
static final double EPS = 1e-9;
Sphere(Vector center, double radius, Material material, Box box) {
Center = center;
Radius = radius;
Material = material;
Box = box;
}
static Sphere NewSphere(Vector center, double radius, Material material) {
Vector min = new Vector(center.getX() - radius, center.getY() - radius, center.getZ() - radius);
Vector max = new Vector(center.getX() + radius, center.getY() + radius, center.getZ() + radius);
Box box = new Box(min, max);
return new Sphere(center, radius, material, box);
}
@Override
public Box BoundingBox() {
return Box;
}
@Override
public Hit Intersect(Ray r) {
Vector to = r.Origin.Sub(Center);
double b = to.Dot(r.Direction);
double c = to.Dot(to) - Radius * Radius;
double d = b * b - c;
if (d > 0) {
d = Math.sqrt(d);
double t1 = -b - d;
if (t1 > EPS) {
return new Hit(this, t1, null);
}
double t2 = -b + d;
if (t2 > EPS) {
return new Hit(this, t2, null);
}
}
return Hit.NoHit;
}
@Override
public Vector UV(Vector p) {
p = p.Sub(Center);
double u = Math.atan2(p.getZ(), p.getX());
double v = Math.atan2(p.getY(), Math.sqrt(p.getX() * p.getX() + p.getZ() * p.getZ()));
u = 1 - (u + Math.PI) / (2 * Math.PI);
v = (v + Math.PI / 2) / Math.PI;
return new Vector(u, v, 0);
}
@Override
public void Compile() {
}
@Override
public Material MaterialAt(Vector p) {
return Material;
}
@Override
public Vector NormalAt(Vector p) {
return p.Sub(Center).Normalize();
}
}