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Added clipping code for near Z plane for triangles. Not yet turned on.

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juniperoserra
2005-04-18 21:36:24 +00:00
parent 3403b8c3f1
commit 0e81844912
2 changed files with 268 additions and 31 deletions
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291
core/PGraphics3.java
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@@ -309,6 +309,7 @@ public class PGraphics3 extends PGraphics {
cameraZ = cameraY / ((float) tan(PI * cameraFOV / 360f));
cameraNear = cameraZ / 10.0f;
cameraFar = cameraZ * 10.0f;
cameraAspect = (float)width / (float)height;
// init lights (in resize() instead of allocate() b/c needed by opengl)
@@ -960,6 +961,37 @@ public class PGraphics3 extends PGraphics {
}
// ------------------------------------------------------------------
// 2D or 3D POINTS FROM MODEL (MX, MY, MZ) TO CAMERA SPACE (VX, VY, VZ)
// It is necessary to do this now because we will be clipping them on
// add_triangle.
for (int i = vertex_start; i < vertex_end; i++) {
float vertex[] = vertices[i];
vertex[VX] =
modelview.m00*vertex[MX] + modelview.m01*vertex[MY] +
modelview.m02*vertex[MZ] + modelview.m03;
vertex[VY] =
modelview.m10*vertex[MX] + modelview.m11*vertex[MY] +
modelview.m12*vertex[MZ] + modelview.m13;
vertex[VZ] =
modelview.m20*vertex[MX] + modelview.m21*vertex[MY] +
modelview.m22*vertex[MZ] + modelview.m23;
vertex[VW] =
modelview.m30*vertex[MX] + modelview.m31*vertex[MY] +
modelview.m32*vertex[MZ] + modelview.m33;
// normalize
if (vertex[VW] != 0 && vertex[VW] != ONE) {
vertex[VX] /= vertex[VW];
vertex[VY] /= vertex[VW];
vertex[VZ] /= vertex[VW];
}
vertex[VW] = ONE;
}
// ------------------------------------------------------------------
// CREATE TRIANGLES
@@ -1026,35 +1058,6 @@ public class PGraphics3 extends PGraphics {
}
// ------------------------------------------------------------------
// 2D or 3D POINTS FROM MODEL (MX, MY, MZ) TO CAMERA SPACE (VX, VY, VZ)
for (int i = vertex_start; i < vertex_end; i++) {
float vertex[] = vertices[i];
vertex[VX] =
modelview.m00*vertex[MX] + modelview.m01*vertex[MY] +
modelview.m02*vertex[MZ] + modelview.m03;
vertex[VY] =
modelview.m10*vertex[MX] + modelview.m11*vertex[MY] +
modelview.m12*vertex[MZ] + modelview.m13;
vertex[VZ] =
modelview.m20*vertex[MX] + modelview.m21*vertex[MY] +
modelview.m22*vertex[MZ] + modelview.m23;
vertex[VW] =
modelview.m30*vertex[MX] + modelview.m31*vertex[MY] +
modelview.m32*vertex[MZ] + modelview.m33;
// normalize
if (vertex[VW] != 0 && vertex[VW] != ONE) {
vertex[VX] /= vertex[VW];
vertex[VY] /= vertex[VW];
vertex[VZ] /= vertex[VW];
}
vertex[VW] = ONE;
}
// ------------------------------------------------------------------
// TRANSFORM / LIGHT / CLIP
@@ -1143,8 +1146,236 @@ public class PGraphics3 extends PGraphics {
pathLength[pathCount-1]++;
}
protected void add_triangle(int a, int b, int c) {
//add_triangle_with_clip(a, b, c);
add_triangle_no_clip(a, b, c);
}
protected final void add_triangle_with_clip(int a, int b, int c) {
boolean aClipped = false;
boolean bClipped = false;
boolean cClipped = false;
int clippedCount = 0;
cameraNear = -8;
if (vertices[a][VZ] > cameraNear) {
aClipped = true;
clippedCount++;
}
if (vertices[b][VZ] > cameraNear) {
bClipped = true;
clippedCount++;
}
if (vertices[c][VZ] > cameraNear) {
cClipped = true;
clippedCount++;
}
if (clippedCount == 0) {
add_triangle_no_clip(a, b, c);
return;
}
else if (clippedCount == 3) {
return;
}
// | .
// In this case there is only one visible point. |/|
// So we'll have to make two new points on the clip line <| |
// and add that triangle instead. |\|
// | .
else if (clippedCount == 2) {
int ca, cb, cc, cd, ce;
if (!aClipped) {
ca = a;
cb = b;
cc = c;
}
else if (!bClipped) {
ca = b;
cb = a;
cc = c;
}
else { //if (!cClipped) {
ca = c;
cb = b;
cc = a;
}
cd = interpolate_clip_vertex(ca, cb);
ce = interpolate_clip_vertex(ca, cc);
add_triangle(ca, cd, ce);
return;
}
// . |
// In this case there are two visible points. |\|
// So we'll have to make two new points on the clip line | |>
// and then add two new triangles. |/|
// . |
else { // (clippedCount == 1) {
int ca, cb, cc, cd, ce;
if (aClipped) {
ca = c;
cb = b;
cc = a;
}
else if (bClipped) {
ca = a;
cb = c;
cc = b;
}
else { //if (cClipped) {
ca = a;
cb = b;
cc = c;
}
cd = interpolate_clip_vertex(ca, cc);
ce = interpolate_clip_vertex(cb, cc);
add_triangle(ca, cd, cb);
add_triangle(cb, cd, ce);
return;
}
}
private final int interpolate_clip_vertex(int a, int b) {
float[] va;
float[] vb;
// Set up va, vb such that va[VZ] >= vb[VZ]
if (vertices[a][VZ] < vertices[b][VZ]) {
va = vertices[b];
vb = vertices[a];
}
else {
va = vertices[a];
vb = vertices[b];
}
float az = va[VZ];
float bz = vb[VZ];
float dz = az - bz;
// If they have the same z, just use pt. a.
if (dz == 0) {
return a;
}
float pa = (az - cameraNear) / dz;
float pb = (cameraNear - bz) / dz;
vertex(pa * va[VX] + pb * vb[VX], pa * va[VY] + pb * vb[VY], pa * az + pb * bz);
int irv = vertexCount - 1;
float[] rv = vertices[irv];
rv[R] = pa * va[R] + pb * vb[R];
rv[G] = pa * va[G] + pb * vb[G];
rv[B] = pa * va[B] + pb * vb[B];
rv[A] = pa * va[A] + pb * vb[A];
rv[U] = pa * va[U] + pb * vb[U];
rv[V] = pa * va[V] + pb * vb[V];
rv[SR] = pa * va[SR] + pb * vb[SR];
rv[SG] = pa * va[SG] + pb * vb[SG];
rv[SB] = pa * va[SB] + pb * vb[SB];
rv[SA] = pa * va[SA] + pb * vb[SA];
rv[NX] = pa * va[NX] + pb * vb[NX];
rv[NY] = pa * va[NY] + pb * vb[NY];
rv[NZ] = pa * va[NZ] + pb * vb[NZ];
rv[SW] = pa * va[SW] + pb * vb[SW];
rv[AR] = pa * va[AR] + pb * vb[AR];
rv[AG] = pa * va[AG] + pb * vb[AG];
rv[AB] = pa * va[AB] + pb * vb[AB];
rv[SPR] = pa * va[SPR] + pb * vb[SPR];
rv[SPG] = pa * va[SPG] + pb * vb[SPG];
rv[SPB] = pa * va[SPB] + pb * vb[SPB];
rv[SPA] = pa * va[SPA] + pb * vb[SPA];
rv[ER] = pa * va[ER] + pb * vb[ER];
rv[EG] = pa * va[EG] + pb * vb[EG];
rv[EB] = pa * va[EB] + pb * vb[EB];
rv[SHINE] = pa * va[SHINE] + pb * vb[SHINE];
rv[BEEN_LIT] = 0;
return irv;
}
protected final void add_triangle(int a, int b, int c) {
/*
static final int X = 0; // transformed xyzw
static final int Y = 1; // formerly SX SY SZ
static final int Z = 2;
static final int R = 3; // actual rgb, after lighting
static final int G = 4; // fill stored here, transform in place
static final int B = 5;
static final int A = 6;
// values that need no transformation
// but will be used in rendering
static final int U = 7; // texture
static final int V = 8;
// incoming values, raw and untransformed
// (won't be used in rendering)
static final int MX = 9; // model coords xyz
static final int MY = 10;
static final int MZ = 11;
static final int SR = 12; // stroke colors
static final int SG = 13;
static final int SB = 14;
static final int SA = 15;
static final int SW = 16; // stroke weight
// not used in rendering
// only used for calculating colors
static final int NX = 17; // normal
static final int NY = 18;
static final int NZ = 19;
static final int VX = 20; // view space coords
static final int VY = 21;
static final int VZ = 22;
static final int VW = 23;
// Ambient color (usually to be kept the same as diffuse)
// fill(_) sets both ambient and diffuse.
static final int AR = 24;
static final int AG = 25;
static final int AB = 26;
// Diffuse is shared with fill.
static final int DR = 3;
static final int DG = 4;
static final int DB = 5;
static final int DA = 6;
//specular (by default kept white)
static final int SPR = 27;
static final int SPG = 28;
static final int SPB = 29;
//GL doesn't use a separate specular alpha, but we do (we're better)
static final int SPA = 30;
static final int SHINE = 31;
//emissive (by default kept black)
static final int ER = 32;
static final int EG = 33;
static final int EB = 34;
//has this vertex been lit yet
static final int BEEN_LIT = 35;
*/
protected final void add_triangle_no_clip(int a, int b, int c) {
//System.out.println("adding triangle " + triangleCount);
if (triangleCount == triangles.length) {
int temp[][] = new int[triangleCount<<1][TRIANGLE_FIELD_COUNT];