Hi
Got it working after a bit of Googling.
The modified polygon method is:
public void toOpenGL(final javax.media.opengl.GLAutoDrawable gLDrawable, final hedgehog.jogl.JOGLObject joglObject)
{
javax.media.opengl.GL gl = gLDrawable.getGL();
javax.media.opengl.glu.GLU glu = new javax.media.opengl.glu.GLU();
javax.media.opengl.glu.GLUtessellator tess = glu.gluNewTess(); // create a pointer to the tesselator object
// tessellator callback
hedgehog.jogl.TessellatorCallBack tessCallback = new hedgehog.jogl.TessellatorCallBack(gl,glu);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_VERTEX, tessCallback);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_BEGIN, tessCallback);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_END, tessCallback);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_ERROR, tessCallback);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_COMBINE, tessCallback);
glu.gluTessBeginPolygon(tess,null);
glu.gluTessBeginContour(tess);
for (int i=0; i<mVertices.size(); i++)
{
double[] coords = mVertices.get(i).toArray();
glu.gluTessVertex(tess,coords,0,coords);
}
glu.gluTessEndContour(tess);
glu.gluTessEndPolygon(tess);
glu.gluDeleteTess(tess); // free up memory allocated to the tesselator object
}
which adds the lines:
// tessellator callback
hedgehog.jogl.TessellatorCallBack tessCallback = new hedgehog.jogl.TessellatorCallBack(gl,glu);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_VERTEX, tessCallback);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_BEGIN, tessCallback);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_END, tessCallback);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_ERROR, tessCallback);
glu.gluTessCallback(tess, javax.media.opengl.glu.GLU.GLU_TESS_COMBINE, tessCallback);
The tessellator callback class is given by:
public class TessellatorCallBack extends javax.media.opengl.glu.GLUtessellatorCallbackAdapter
{
////////////
// fields //
////////////
/** The GL. */
private javax.media.opengl.GL gl;
/** The GL utility. */
private javax.media.opengl.glu.GLU glu;
//////////////////
// constructors //
//////////////////
/**
* Constructor.
* @param gl The GL.
* @param glu The GL utility.
*/
public TessellatorCallBack(javax.media.opengl.GL gl, javax.media.opengl.glu.GLU glu)
{
super();
this.gl = gl;
this.glu = glu;
}
////////////////////////
// overridden methods //
////////////////////////
/**
* Invoked like glBegin to indicate the start of a (triangle) primitive.
* @param type Specifics the type of begin/end pair being defined. The following values are valid: GL_TRIANGLE_FAN, GL_TRIANGLE_STRIP, GL_TRIANGLES or GL_LINE_LOOP.
*/
@Override
public void begin(int type)
{
gl.glBegin(type);
}
/**
* The end callback serves the same purpose as glEnd.
*/
@Override
public void end()
{
gl.glEnd();
}
/**
* Is invoked between the begin and end callback methods.
* @param vertexData Vertex data.
*/
@Override
public void vertex(Object vertexData)
{
gl.glVertex3dv((double[])vertexData,0);
}
/**
* Called to create a new vertex when the tessellation detects an intersection, or wishes to merge features.
* Coordinate location is trivial to calculate, but weight[4] may be used to average color, normal, or texture coordinate data.
* @param coords Specifics the location of the new vertex.
* @param data Specifics the vertices used to create the new vertex.
* @param weight Specifics the weights used to create the new vertex.
* @param outData Reference user the put the coodinates of the new vertex.
*/
@Override
public void combine(double[] coords, Object[] data, float[] weight, Object[] outData)
{
double[] vertex = new double[3];
vertex[0] = coords[0];
vertex[1] = coords[1];
vertex[2] = coords[2];
outData[0] = vertex;
}
/**
* The error callback method is called when an error is encountered.
* @param errnum Error number.
*/
@Override
public void error(int errnum)
{
System.err.println("Tessellation Error: " + glu.gluErrorString(errnum));
System.exit(0);
}
} // class TessellatorCallBack
