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calcTrianglesNormals() implementation

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codeanticode
2012-01-10 01:49:19 +00:00
parent d3e16b34fb
commit 52f29dc97f
1 changed files with 52 additions and 1 deletions
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53
java/libraries/opengl/src/processing/opengl/PGraphicsOpenGL.java
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@@ -6646,7 +6646,58 @@ public class PGraphicsOpenGL extends PGraphics {
}
public void calcTrianglesNormals() {
for (int i = 0; i < (lastVertex - firstVertex + 1) / 3; i++) {
int i0 = 3 * i + 0;
int i1 = 3 * i + 1;
int i2 = 3 * i + 2;
int index;
index = 3 * i0;
float x0 = vertices[index++];
float y0 = vertices[index++];
float z0 = vertices[index ];
index = 3 * i1;
float x1 = vertices[index++];
float y1 = vertices[index++];
float z1 = vertices[index ];
index = 3 * i2;
float x2 = vertices[index++];
float y2 = vertices[index++];
float z2 = vertices[index ];
float v12x = x2 - x1;
float v12y = y2 - y1;
float v12z = z2 - z1;
float v10x = x0 - x1;
float v10y = y0 - y1;
float v10z = z0 - z1;
float nx = v12y * v10z - v10y * v12z;
float ny = v12z * v10x - v10z * v12x;
float nz = v12x * v10y - v10x * v12y;
float d = PApplet.sqrt(nx * nx + ny * ny + nz * nz);
nx /= d;
ny /= d;
nz /= d;
index = 3 * i0;
normals[index++] = nx;
normals[index++] = ny;
normals[index ] = nz;
index = 3 * i1;
normals[index++] = nx;
normals[index++] = ny;
normals[index ] = nz;
index = 3 * i2;
normals[index++] = nx;
normals[index++] = ny;
normals[index ] = nz;
}
}
public void addTrianglesEdges() {