will try it out...how about adding some base functionality in Xith .
What i have in mind is to able to specify a convex closed ploygon on a plane and depth upto which it should be extruded.
I have wriiten a small class for it ,please give your input to improve this.
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| import javax.vecmath.Point3f;
import com.xith3d.scenegraph.GeometryArray;
import com.xith3d.scenegraph.Shape3D;
import com.xith3d.scenegraph.TriangleStripArray;
public class GeometryExtruder extends Shape3D {
private float extrusonLength;
public GeometryExtruder(float length, Point3f[] coordsArray) {
super();
this.extrusonLength = length;
int [b]numLayers [/b]= 8;
float depthShift = -this.extrusonLength/numLayers;
Point3f point;
Point3f[] coords = new Point3f[1+numLayers*(2*coordsArray.length+1)];
int counter = 0;
for (int j = 0; j < numLayers; j++) {
for (int i = 0; i < coordsArray.length; i++) {
if(j==0){
point = new Point3f(coordsArray[i]);
coords[counter++] = point;
}else{
coords[counter++] =coords[(j-1)*(coordsArray.length*2+1)+i*2+1];
}
point = new Point3f(coordsArray[i].x, coordsArray[i].y,coordsArray[i].z + depthShift);
coords[counter++] = point;
}
coords[counter++] =coords[j*(coordsArray.length*2+1)];
for(int i=0;i<coordsArray.length;i++){
coordsArray[i].z= coordsArray[i].z+depthShift;
}
}
coords[counter++]=coords[(numLayers-1)*(coordsArray.length*2+1)+1];
TriangleStripArray qa = null;
int flags = GeometryArray.COORDINATES;
qa = new TriangleStripArray(coords.length, flags,
new int[] { coords.length });
qa.setCoordinates(0, coords);
super.setGeometry(qa);
}
} |
It takes arguments :
1.
Point3f[] coordsArray :vertices of convex polygon in XY Plane
ex: To draw a extruded pentagon Point a=(0,0,0),
Point b=(3,0,0),
Point c=(4,2,0),
Point a=(0,4,0)
2.
float length :length in Z axis upto which this pentagon should be extruded.
Variable
numlength is just variable to specify in how many layers this pentagon should be extruded.
