private float getCylinderDistance(IVector3f i_rayOrigin, IVector3f i_rayDirection) {
// if we hit one of the end caps, we are done
float d = getCapDistance(i_rayOrigin, i_rayDirection);
if (!Float.isNaN(d)) return d;
// it's much quicker to intersect with a cylinder that stands on the
// origin and extends along the positive Z axis, so translate the ray
// accordingly
Vector3f newOrigin = Draw3DCache.getVector3f();
try {
Math3D.translate(i_rayOrigin, -0.5f, -0.5f, 0, newOrigin);
// now intersect with infinite cylinder along Z axis:
float xo = newOrigin.getX();
float yo = newOrigin.getY();
float xd = i_rayDirection.getX();
float yd = i_rayDirection.getY();
float A = xd * xd + yd * yd;
float B = 2 * (xo * xd + yo * yd);
float C = xo * xo + yo * yo - 0.25f; // radius^2 = 0.25f
Math3D.solveQuadraticEquation(A, B, C, TMP_F2);
return Math3D.minDistance(TMP_F2);
} finally {
Draw3DCache.returnVector3f(newOrigin);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.draw3d.ISurface#getSurfaceRotation(org.eclipse.draw3d.geometry.Vector3f)
*/
public Vector3f getSurfaceRotation(Vector3f o_result) {
Vector3f zAxis = Draw3DCache.getVector3f();
try {
getZAxis(zAxis);
return Math3D.eulerAngles(zAxis, IVector3f.Z_AXIS, o_result);
} finally {
Draw3DCache.returnVector3f(zAxis);
}
}
private float getConeDistance(IVector3f i_rayOrigin, IVector3f i_rayDirection) {
// if we hit an end cap, we are done
float d = getCapDistance(i_rayOrigin, i_rayDirection);
if (!Float.isNaN(d)) return d;
// it's much quicker to intersect with a cone whose apex is the
// origin and that extends along the positive Z axis, so translate the
// ray accordingly
Vector3f newOrigin = Draw3DCache.getVector3f();
try {
Math3D.translate(i_rayOrigin, -0.5f, -0.5f, 0, newOrigin);
return doGetConeDistance(newOrigin, i_rayDirection, 0, 1);
} finally {
Draw3DCache.returnVector3f(newOrigin);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.draw3d.ISurface#findFigureAt(int, int, org.eclipse.draw2d.TreeSearch)
*/
public IFigure findFigureAt(int i_sx, int i_sy, TreeSearch i_search) {
Point sLocation = Draw3DCache.getPoint();
Vector3f rayPoint = Draw3DCache.getVector3f();
try {
Picker picker = m_scene.getPicker();
ISurface currentSurface = picker.getCurrentSurface();
sLocation.setLocation(i_sx, i_sy);
currentSurface.getWorldLocation(sLocation, rayPoint);
Hit hit = picker.getHit(rayPoint, i_search);
if (hit != null) return hit.getSearchResult();
if (i_search == null || (!i_search.prune(m_host) && i_search.accept(m_host))) return m_host;
return null;
} finally {
Draw3DCache.returnPoint(sLocation);
Draw3DCache.returnVector3f(rayPoint);
}
}
