private void modifyProjectionMatrix(final Vector4 clipPlane) {
// Get the current projection matrix
projectionMatrix = cam.getProjectionMatrix().toArray(projectionMatrix);
// Get the inverse transpose of the current modelview matrix
final ReadOnlyMatrix4 modelViewMatrixInvTrans =
tRenderer.getCamera().getModelViewMatrix().invert(tmpMatrix).transposeLocal();
modelViewMatrixInvTrans.applyPre(clipPlane, clipPlane);
// Calculate the clip-space corner point opposite the clipping plane
// as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
// transform it into camera space by multiplying it
// by the inverse of the projection matrix
cornerPoint.setX((sign(clipPlane.getX()) + projectionMatrix[8]) / projectionMatrix[0]);
cornerPoint.setY((sign(clipPlane.getY()) + projectionMatrix[9]) / projectionMatrix[5]);
cornerPoint.setZ(-1.0);
cornerPoint.setW((1.0 + projectionMatrix[10]) / projectionMatrix[14]);
// Calculate the scaled plane vector
final Vector4 scaledPlaneVector =
clipPlane.multiply((2.0 / clipPlane.dot(cornerPoint)), cornerPoint);
// Replace the third row of the projection matrix
projectionMatrix[2] = scaledPlaneVector.getX();
projectionMatrix[6] = scaledPlaneVector.getY();
projectionMatrix[10] = scaledPlaneVector.getZ() + 1.0;
projectionMatrix[14] = scaledPlaneVector.getW();
// Load it back into OpenGL
final Matrix4 newProjectionMatrix = tmpMatrix.fromArray(projectionMatrix);
tRenderer.getCamera().setProjectionMatrix(newProjectionMatrix);
}
/** Render water refraction RTT */
private void renderRefraction(final Vector4 clipPlane) {
if (renderList.isEmpty()) {
return;
}
refractionTime += tpf;
if (refractionTime < refractionThrottle) {
return;
}
refractionTime = 0;
// tRenderer.getCamera().set(cam);
tRenderer.getCamera().setLocation(cam.getLocation());
tRenderer.getCamera().setDirection(cam.getDirection());
tRenderer.getCamera().setUp(cam.getUp());
tRenderer.getCamera().setLeft(cam.getLeft());
CullHint cullMode = CullHint.Dynamic;
if (skyBox != null) {
cullMode = skyBox.getSceneHints().getCullHint();
skyBox.getSceneHints().setCullHint(CullHint.Always);
}
tRenderer.getCamera().setProjectionMatrix(cam.getProjectionMatrix());
texArray.clear();
texArray.add(textureRefract);
texArray.add(textureDepth);
tRenderer.getCamera().update();
tRenderer.getCamera().getModelViewMatrix();
tRenderer.getCamera().getProjectionMatrix();
tRenderer.render(renderList, texArray, Renderer.BUFFER_COLOR_AND_DEPTH);
if (skyBox != null) {
skyBox.getSceneHints().setCullHint(cullMode);
}
}
/** Render water reflection RTT */
private void renderReflection(final Vector4 clipPlane) {
if (renderList.isEmpty()) {
return;
}
reflectionTime += tpf;
if (reflectionTime < reflectionThrottle) {
return;
}
reflectionTime = 0;
if (aboveWater) {
camLocation.set(cam.getLocation());
double planeDistance = waterPlane.pseudoDistance(camLocation);
calcVect.set(waterPlane.getNormal()).multiplyLocal(planeDistance * 2.0f);
camReflectPos.set(camLocation.subtractLocal(calcVect));
camLocation.set(cam.getLocation()).addLocal(cam.getDirection());
planeDistance = waterPlane.pseudoDistance(camLocation);
calcVect.set(waterPlane.getNormal()).multiplyLocal(planeDistance * 2.0f);
camReflectDir
.set(camLocation.subtractLocal(calcVect))
.subtractLocal(camReflectPos)
.normalizeLocal();
camLocation.set(cam.getLocation()).addLocal(cam.getUp());
planeDistance = waterPlane.pseudoDistance(camLocation);
calcVect.set(waterPlane.getNormal()).multiplyLocal(planeDistance * 2.0f);
camReflectUp
.set(camLocation.subtractLocal(calcVect))
.subtractLocal(camReflectPos)
.normalizeLocal();
camReflectLeft.set(camReflectUp).crossLocal(camReflectDir).normalizeLocal();
tRenderer.getCamera().setLocation(camReflectPos);
tRenderer.getCamera().setDirection(camReflectDir);
tRenderer.getCamera().setUp(camReflectUp);
tRenderer.getCamera().setLeft(camReflectLeft);
} else {
tRenderer.getCamera().setLocation(cam.getLocation());
tRenderer.getCamera().setDirection(cam.getDirection());
tRenderer.getCamera().setUp(cam.getUp());
tRenderer.getCamera().setLeft(cam.getLeft());
}
if (skyBox != null) {
tmpLocation.set(skyBox.getTranslation());
skyBox.setTranslation(tRenderer.getCamera().getLocation());
skyBox.updateGeometricState(0.0f);
skyBox.getSceneHints().setCullHint(CullHint.Never);
}
texArray.clear();
if (doBlurReflection) {
texArray.add(textureReflect);
} else {
texArray.add(textureReflectBlur);
}
tRenderer.getCamera().setProjectionMode(ProjectionMode.Custom);
tRenderer.getCamera().setProjectionMatrix(cam.getProjectionMatrix());
tRenderer.render(skyBox, texArray, Renderer.BUFFER_COLOR_AND_DEPTH);
if (skyBox != null) {
skyBox.getSceneHints().setCullHint(CullHint.Always);
}
modifyProjectionMatrix(clipPlane);
tRenderer.render(renderList, texArray, Renderer.BUFFER_NONE);
if (doBlurReflection) {
blurReflectionTexture();
}
if (skyBox != null) {
skyBox.setTranslation(tmpLocation);
skyBox.updateGeometricState(0.0f);
skyBox.getSceneHints().setCullHint(CullHint.Never);
}
}
