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Topic: 3d Landscape Generation from 2 Images (Read 715 times) |
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madmerv
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3d Landscape Generation from 2 Images
« on: Nov 12th, 2003, 7:13pm » |
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// Vector-based Landscape Renderer (Example 2)
// by merv <http://www.madmerv.com>
// Draw a 3d landscape based on 2 images.
// Dimensions must be divisible by 2 (for best results).
// Both images must share the same dimensions.
// Image1: Color Map
// Image2: Height Map
// Created 10 November 2003
float xmag, ymag = 0;
float newXmag, newYmag = 0;
float xyzscale = 1;
float delta = 0.01;
int xRes = 640;
int yRes = 480;
int xcount;
int ycount;
BImage img;
BImage bump;
float vsize = .075; // distance between vertices
void svertex( float x, float y, float z, color c )
{
fill( c );
vertex( x*xyzscale, y*xyzscale, z*xyzscale );
}
void setup()
{
size(xRes, yRes);
noStroke();
colorMode(RGB, 1);
}
void loop()
{
int count;
background(0, 0, .2);
img = loadImage("marsfacetex.jpg");
bump = loadImage("marsfacebmp.gif");
// img = loadImage("texturesm.gif");
// bump = loadImage("bumpsm.gif");
push();
translate(width/2, height/2, -30);
newXmag = mouseX/float(width) * TWO_PI;
newYmag = mouseY/float(height) * TWO_PI;
float diff = xmag-newXmag;
if (abs(diff) > 0.01) { xmag -= diff/4.0; }
diff = ymag-newYmag;
if (abs(diff) > 0.01) { ymag -= diff/4.0; }
rotateX(-ymag);
rotateY(-xmag);
scale(50);
if ((xyzscale >= 3) || (xyzscale <= 0.4)) {
delta = -delta;
}
xyzscale = xyzscale + delta;
// beginShape(QUADS);
// prism( 0, 0, 0, 1, 1, 1 );
// endShape();
int dimx = img.width;
int dimx2 = img.width/2;
int dimy = img.height;
int dimy2 = img.height/2;
color xy1, xy2, xy3, xy4;
for ( xcount = -(dimx2); xcount < dimx2-1; xcount=xcount+1 ) {
for ( ycount = -(dimy2); ycount < dimy2-1; ycount=ycount+1 ) {
beginShape(QUADS);
float vheight;
// if i use this next line instead of the following, also does not work:
// xy2 = red(bump.pixels[(xcount+bump.width/2)+(bump.width*(ycount+bump.height/2))]);
xy1 = bump.pixels[(xcount+dimx2)+(dimx*(ycount+dimy2))];
xy2 = bump.pixels[(xcount+1+dimx2)+(dimx*(ycount+dimy2))];
xy3 = bump.pixels[(xcount+dimx2)+(dimx*(ycount+1+dimy2))];
xy4 = bump.pixels[(xcount+1+dimx2)+(dimx*(ycount+1+dimy2))];
vheight = ((xy1 % 256)/32);
vheight = min(vsize,vheight);
svertex( vsize*xcount, vsize*ycount, vsize*vheight,
img.pixels[(xcount+dimx2)+(dimx*(ycount+dimy2))] );
vheight = ((xy3 % 256)/32);
vheight = min(vsize,vheight);
svertex( vsize*xcount, vsize*ycount + vsize, vsize*vheight,
img.pixels[(xcount+dimx2)+(dimx*(ycount+1+dimy2))] );
vheight = ((xy4 % 256)/32);
vheight = min(vsize,vheight);
svertex( vsize*xcount + vsize, vsize*ycount + vsize, vsize*vheight,
img.pixels[(xcount+1+dimx2)+(dimx*(ycount+1+dimy2))] );
vheight = ((xy2 % 256)/32);
vheight = min(vsize,vheight);
svertex( vsize*xcount + vsize, vsize*ycount, vsize*vheight,
img.pixels[(xcount+1+dimx2)+(dimx*(ycount+dimy2))] );
endShape();
}
}
pop();
}
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