Hey all,
So I had to figure out exactly how to use a clip state; and it was surprisingly hard to find a straight answer, even from 3 books, the jME test and google… My next decision was to take the ClipStateTest and modify it so I could play around with the variables and try to figure it out; surprise surprise its just the plane normal and distance (from orgin). Anyways, it is probably WAY overkill but this modified test shows exactly how to use a clip plane and I thought it might be good to update the current test to help others. What do you think??
Index: TestClipState.java
--- TestClipState.java Base (BASE)
+++ TestClipState.java Locally Modified (Based On LOCAL)
@@ -35,64 +35,185 @@
import com.jme.app.SimpleGame;
import com.jme.bounding.BoundingSphere;
import com.jme.image.Texture;
+import com.jme.input.FirstPersonHandler;
+import com.jme.input.KeyBindingManager;
+import com.jme.input.KeyInput;
+import com.jme.input.MouseInput;
+import com.jme.math.FastMath;
import com.jme.math.Vector3f;
-import com.jme.scene.TriMesh;
+import com.jme.renderer.ColorRGBA;
+import com.jme.renderer.Renderer;
import com.jme.scene.shape.Box;
+import com.jme.scene.shape.Quad;
+import com.jme.scene.state.BlendState;
+import com.jme.scene.state.BlendState.DestinationFunction;
+import com.jme.scene.state.BlendState.SourceFunction;
import com.jme.scene.state.ClipState;
+import com.jme.scene.state.CullState;
import com.jme.scene.state.TextureState;
import com.jme.util.TextureManager;
+
+
/**
* <code>TestClipState</code>
* @author Mark Powell
* @version $Id: TestClipState.java,v 1.3 2006/01/13 19:37:15 renanse Exp $
+ * @version $Id: TestClipState.java,v 1.4 2008/12/29 23:44:21 basixs Exp $
*/
public class TestClipState extends SimpleGame {
- private TriMesh t;
+ private ClipState clipState = null;
+ private final Vector3f planeNormal = new Vector3f( 1, 0, 0 );
+ private float dist = 50;
+ //
+ private final Quad psuedoPlane = new Quad( "", 1000, 1000 );
+
/**
* Entry point for the test,
* @param args
*/
- public static void main(String[] args) {
+ public static void main( String[] args ) {
TestClipState app = new TestClipState();
- app.setConfigShowMode(ConfigShowMode.AlwaysShow);
+ app.setConfigShowMode( ConfigShowMode.AlwaysShow );
app.start();
}
- /**
- * builds the trimesh.
- * @see com.jme.app.SimpleGame#initGame()
- */
+ @Override
+ protected void simpleUpdate() {
+ boolean update = false;
+ double change = 0;
+
+ if( KeyBindingManager.getKeyBindingManager().isValidCommand( "UP", true ) ){
+ change = 0.1;
+ update = true;
+ }
+ if( KeyBindingManager.getKeyBindingManager().isValidCommand( "DOWN", true ) ){
+ change = -0.1;
+ update = true;
+ }
+
+ if( KeyBindingManager.getKeyBindingManager().isValidCommand( "X", false ) ){
+ planeNormal.set( 1, 0, 0 );
+ update = true;
+ }
+ if( KeyBindingManager.getKeyBindingManager().isValidCommand( "Y", false ) ){
+ planeNormal.set( 0, 1, 0 );
+ update = true;
+ }
+ if( KeyBindingManager.getKeyBindingManager().isValidCommand( "Z", false ) ){
+ planeNormal.set( 0, 0, 1 );
+ update = true;
+ }
+ if( KeyBindingManager.getKeyBindingManager().isValidCommand( "NEGATE", false ) ){
+ planeNormal.negateLocal();
+ update = true;
+ }
+
+ if( KeyBindingManager.getKeyBindingManager().isValidCommand( "RESET", false ) ){
+ planeNormal.set( 1, 0, 0 );
+ dist = 50;
+ }
+
+ if( KeyBindingManager.getKeyBindingManager().isValidCommand( "TOGGLE", false ) ){
+ clipState.setEnabled( !clipState.isEnabled() );
+ }
+
+ if( update == true ){
+ dist += change;
+ clipState.setClipPlaneEquation( ClipState.CLIP_PLANE0, planeNormal.x, planeNormal.y, planeNormal.z, dist );
+ updateQuadPosition();
+ System.out.println( "Plane Equation: " + planeNormal + "tDist: " + dist );
+ }
+ }
+
protected void simpleInitGame() {
- display.setTitle("Clip State Test");
- cam.setLocation(new Vector3f(-10,0,40));
- cam.update();
- Vector3f max = new Vector3f(100,100,100);
- Vector3f min = new Vector3f(0,0,0);
+ KeyBindingManager.getKeyBindingManager().set( "UP", KeyInput.KEY_PERIOD );
+ KeyBindingManager.getKeyBindingManager().set( "DOWN", KeyInput.KEY_COMMA );
+ //
+ KeyBindingManager.getKeyBindingManager().set( "X", KeyInput.KEY_X );
+ KeyBindingManager.getKeyBindingManager().set( "Y", KeyInput.KEY_Y );
+ KeyBindingManager.getKeyBindingManager().set( "Z", KeyInput.KEY_Z );
+ KeyBindingManager.getKeyBindingManager().set( "NEGATE", KeyInput.KEY_SPACE );
+ KeyBindingManager.getKeyBindingManager().set( "RESET", KeyInput.KEY_R );
+ KeyBindingManager.getKeyBindingManager().set( "TOGGLE", KeyInput.KEY_RETURN );
- t = new Box("Box", min,max);
- t.setModelBound(new BoundingSphere());
- t.updateModelBound();
+ display.setTitle( "Clip State Test" );
+ cam.setLocation( new Vector3f( -300, 300, 300 ) );
+ cam.lookAt( Vector3f.ZERO, Vector3f.UNIT_Y );
+ cam.update();
- t.setLocalTranslation(new Vector3f(-50,0,-75));
+ lightState.setEnabled( false );
+ MouseInput.get().setCursorVisible( true );
+ ((FirstPersonHandler) input ).setButtonPressRequired( true );
- rootNode.attachChild(t);
+ Vector3f max = new Vector3f( 100, 100, 100 );
+ Vector3f min = new Vector3f( -100, -100, -100 );
+ final Box box = new Box( "Box", min, max );
+ box.setModelBound( new BoundingSphere() );
+ box.updateModelBound();
+
TextureState ts = display.getRenderer().createTextureState();
- ts.setEnabled(true);
+ ts.setEnabled( true );
ts.setTexture(
TextureManager.loadTexture(
- TestClipState.class.getClassLoader().getResource("jmetest/data/images/Monkey.jpg"),
+ TestClipState.class.getClassLoader().getResource( "jmetest/data/images/Monkey.jpg" ),
Texture.MinificationFilter.Trilinear,
- Texture.MagnificationFilter.Bilinear));
+ Texture.MagnificationFilter.Bilinear ) );
- rootNode.setRenderState(ts);
+ box.setRenderState( ts );
- ClipState clipState = display.getRenderer().createClipState();
- clipState.setEnableClipPlane(ClipState.CLIP_PLANE0, true);
- clipState.setClipPlaneEquation(ClipState.CLIP_PLANE0, 0.5, 0.5, 0.0, 0.0);
- rootNode.setRenderState(clipState);
+ rootNode.attachChild( box );
+
+ clipState = display.getRenderer().createClipState();
+ clipState.setEnableClipPlane( ClipState.CLIP_PLANE0, true );
+ clipState.setClipPlaneEquation( ClipState.CLIP_PLANE0, planeNormal.x, planeNormal.y, planeNormal.z, dist );
+ rootNode.setRenderState( clipState );
+
+ initPseudoPlane();
+ rootNode.attachChild( psuedoPlane );
}
+
+ private void updateQuadPosition() {
+ final Vector3f tempVector = new Vector3f();
+
+ if( planeNormal.x == 1 || planeNormal.x == -1 ){
+ tempVector.set( 0, 1, 0 );
+
+ } else if( planeNormal.y == 1 || planeNormal.y == -1 ){
+ tempVector.set( 1, 0, 0 );
+
+ } else if( planeNormal.z == 1 || planeNormal.z == -1 ){
+ tempVector.set( 0, 0, 1 );
}
+ psuedoPlane.getLocalRotation().fromAngleNormalAxis( FastMath.HALF_PI, tempVector );
+ psuedoPlane.getLocalTranslation().set( planeNormal ).multLocal( ( dist - 0.1f ) ).negateLocal();
+ psuedoPlane.updateGeometricState( 0, true );
+ }
+
+ private void initPseudoPlane() {
+
+ psuedoPlane.setDefaultColor( new ColorRGBA( 1, 0, 0, 0.5f ) );
+
+
+ final CullState cullState = display.getRenderer().createCullState();
+ cullState.setCullFace( CullState.Face.None );
+
+ final BlendState blendState = display.getRenderer().createBlendState();
+ blendState.setSourceFunctionAlpha( SourceFunction.SourceAlpha );
+ blendState.setDestinationFunctionAlpha( DestinationFunction.OneMinusSourceAlpha );
+ blendState.setEnabled( true );
+ blendState.setTestEnabled( true );
+ blendState.setBlendEnabled( true );
+ blendState.setTestFunction( BlendState.TestFunction.NotEqualTo );
+
+ psuedoPlane.setRenderState( blendState );
+ psuedoPlane.setRenderQueueMode( Renderer.QUEUE_TRANSPARENT );
+ psuedoPlane.updateRenderState();
+
+ updateQuadPosition();
+
+ }
+}
