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Copy pathCube.java
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136 lines (119 loc) · 4.76 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 Cube extends TransformedShape {
Vector Min;
Vector Max;
Material Material;
Box Box;
static final double EPS = 1e-9;
Cube(Vector min, Vector max, Material material, Box box) {
this.Min = min;
this.Max = max;
this.Material = material;
this.Box = box;
}
static Cube NewCube(Vector min, Vector max, Material material) {
Box box = new Box(min, max);
return new Cube(min, max, material, box);
}
@Override
public void Compile() {
}
@Override
public Box BoundingBox() {
return Box;
}
@Override
public Hit Intersect(Ray r) {
Vector n = Min.Sub(r.Origin).Div(r.Direction);
Vector f = Max.Sub(r.Origin).Div(r.Direction);
Vector min = n.Min(f);
Vector max = n.Max(f);
double t0 = Math.max(Math.max(min.getX(), min.getY()), min.getZ());
double t1 = Math.min(Math.min(max.getX(), max.getY()), max.getZ());
if (t0 > EPS && t0 < t1) {
return new Hit(this, t0, null);
}
if (t1 > EPS && t0 < t1) {
return new Hit(this, t1, null);
}
return Hit.NoHit;
}
@Override
public Vector UV(Vector p) {
p = p.Sub(Min).Div(Max.Sub(Min));
return new Vector(p.getX(), p.getZ(), 0);
}
@Override
public Material MaterialAt(Vector p) {
return Material;
}
@Override
public Vector NormalAt(Vector p) {
if (p.getX() < this.Min.getX() + EPS) {
return new Vector(-1, 0, 0);
} else if (p.getX() > this.Max.getX() - EPS) {
return new Vector(1, 0, 0);
} else if (p.getY() < this.Min.getY() + EPS) {
return new Vector(0, -1, 0);
} else if (p.getY() > this.Max.getY() - EPS) {
return new Vector(0, 1, 0);
} else if (p.getZ() < this.Min.getZ() + EPS) {
return new Vector(0, 0, -1);
} else if (p.getZ() > this.Max.getZ() - EPS) {
return new Vector(0, 0, 1);
}
return new Vector(0, 1, 0);
}
Mesh Mesh() {
Vector a = Min;
Vector b = Max;
Vector z = new Vector();
Material m = Material;
var v000 = new Vector(a.getX(), a.getY(), a.getZ());
var v001 = new Vector(a.getX(), a.getY(), b.getZ());
var v010 = new Vector(a.getX(), b.getY(), a.getZ());
var v011 = new Vector(a.getX(), b.getY(), b.getZ());
var v100 = new Vector(b.getX(), a.getY(), a.getZ());
var v101 = new Vector(b.getX(), a.getY(), b.getZ());
var v110 = new Vector(b.getX(), b.getY(), a.getZ());
var v111 = new Vector(b.getX(), b.getY(), b.getZ());
Triangle[] triangles = {
Triangle.NewTriangle(v000, v100, v110, z, z, z, m),
Triangle.NewTriangle(v000, v110, v010, z, z, z, m),
Triangle.NewTriangle(v001, v101, v111, z, z, z, m),
Triangle.NewTriangle(v001, v111, v011, z, z, z, m),
Triangle.NewTriangle(v000, v100, v101, z, z, z, m),
Triangle.NewTriangle(v000, v101, v001, z, z, z, m),
Triangle.NewTriangle(v010, v110, v111, z, z, z, m),
Triangle.NewTriangle(v010, v111, v011, z, z, z, m),
Triangle.NewTriangle(v000, v010, v011, z, z, z, m),
Triangle.NewTriangle(v000, v011, v001, z, z, z, m),
Triangle.NewTriangle(v100, v110, v111, z, z, z, m),
Triangle.NewTriangle(v100, v111, v101, z, z, z, m)
};
return new Mesh(triangles, null, null);
}
}