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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
*/
package net.java.joglutils.msg.nodes;
import java.util.*;
import net.java.joglutils.msg.actions.*;
import net.java.joglutils.msg.elements.*;
import net.java.joglutils.msg.impl.*;
import net.java.joglutils.msg.math.*;
import net.java.joglutils.msg.misc.*;
/** The abstract base class for all shapes in the scene graph which
render themselves as a collection of triangles. */
public abstract class TriangleBasedShape extends Shape {
/** Based on the state in the given Action, calls the specified
triangle callback for each triangle in the shape. Coordinates
are specified in the local coordinate system of this shape; the
caller must transform them into the world coordinate system if
necessary. */
public abstract void generateTriangles(Action action,
TriangleCallback cb);
public void rayPick(final RayPickAction action) {
// The RayPickAction holds the picking ray in world coordinates.
// Transform this ray into local coordinates to do intersection testing
// Fetch the current local-to-world matrix
Mat4f mat = new Mat4f(ModelMatrixElement.getInstance(action.getState()).getMatrix());
// Invert it to get the world-to-local matrix
mat.invert();
// Transform the RayPickAction's ray by this matrix
final Line ray = mat.xformLine(action.getComputedRay());
// Temporaries
final RayTriangleIntersection rti = new RayTriangleIntersection();
final Vec3f tuv = new Vec3f();
// OK, ready to test
generateTriangles(action, new TriangleCallback() {
public void triangleCB(int triangleIndex,
PrimitiveVertex v0,
int i0,
PrimitiveVertex v1,
int i1,
PrimitiveVertex v2,
int i2) {
if (rti.intersectTriangle(ray,
v0.getCoord(),
v1.getCoord(),
v2.getCoord(),
tuv)) {
// Compute at least the 3D coordinate of the intersection
// point for now
// FIXME: need to compute other things such as the texture
// coordinates
PickedPoint p = new PickedPoint();
// Compute weights of three vertices
float a = 1.0f - tuv.y() - tuv.z();
float b = tuv.y();
float c = tuv.z();
Vec3f loc = v0.getCoord().times(a).plus(v1.getCoord().times(b)).plus(v2.getCoord().times(c));
p.setCoord(loc);
p.setPath(action.getPath().copy());
action.addPickedPoint(p, tuv.x());
}
}
});
}
}
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