Multitexturing with renderPass

Troubleshooting General Help
1

Hello all,



Okay, after three days of searching and trying I give up.



I want the following: I have two textures that should be added to an object. the first one is the “ground”-texture and has no alpha-information. The second is one is a .png-file with alpha-information and I want to add the colored parts of this texture to the first one (and so I’m using multitexturing).



Using the texture-units of my gpu works fine, but I figured out, that I need much more than 4 Texture-Unit, so I tried the Renderpass-Tutorial and it worked, but the result isn’t what I want.



In the example and in the code below the renderer uses the color white of the second texture to blend both textures together and ignores the alpha-Value of the png-File.



Here is what I have. I’m using SimplePassGame.



display.setTitle(“Multitexturing”);

display.setVSyncEnabled(true);

cam.setLocation(new Vector3f(-40, 40, 40));

cam.lookAt(new Vector3f(0,0,0), Vector3f.UNIT_Y);

cam.update();





TextureState ts1 = display.getRenderer().createTextureState();

ts1.setTexture(Texter.load(path+“blue.png”));



TextureState ts2 = display.getRenderer().createTextureState();

Texture t1 = Texter.load(path+“alphatest.png”);

t1.setApply(ApplyMode.Decal);

ts2.setTexture(t1);



BlendState bs = display.getRenderer().createBlendState();

bs.setSourceFunction(BlendState.SourceFunction.DestinationColor);

bs.setDestinationFunction(BlendState.DestinationFunction.SourceColor);

bs.setBlendEnabled(true);

   

b = new Box(“Box”, new Vector3f(5, 5, 5), new Vector3f( -5, -5, -5));



RenderPass rp1 = new RenderPass();

rp1.setPassState(ts1);

rp1.add(b);



RenderPass rp2 = new RenderPass();

rp2.setPassState(ts2);

rp2.setPassState(bs);

rp2.add(b);



pManager.add(rp1);

pManager.add(rp2);



rootNode.attachChild(b);









Thanks for your help.

2

Okay, I found a solution in the Test "TestPassNode" of the jme-Tests.

3
ceiphren said:

Okay, I found a solution in the Test "TestPassNode" of the jme-Tests.


Please always post the solution you found so others find it here when they have the same problem.
4

No prob.



The Test is the solution, but with a heavy bunch of code (267 line) and shows what is possible.



Here is my  spartan version (41 lines):



display.setTitle("Multitexturing");

display.setVSyncEnabled(true);

cam.setLocation(new Vector3f(-40, 40, 40));

cam.lookAt(new Vector3f(0,0,0), Vector3f.UNIT_Y);

cam.update();



b = new Box("Box", new Vector3f(5, 5, 5), new Vector3f( -5, -5, -5));



TextureState ts1 = display.getRenderer().createTextureState();

       Texture t0 = TextureManager.loadTexture(

               Core.class.getClassLoader().getResource("textures/blue.png"),

               Texture.MinificationFilter.Trilinear, Texture.MagnificationFilter.Bilinear);

ts1.setTexture(Texter.load(path+"blue.png"),0);



TextureState ts2 = display.getRenderer().createTextureState();

       Texture t1 = TextureManager.loadTexture(

               Core.class.getClassLoader().getResource("textures/green_alphas.png"),

               Texture.MinificationFilter.Trilinear, Texture.MagnificationFilter.Bilinear);

ts2.setTexture(t1);



BlendState bs = display.getRenderer().createBlendState();

bs.setBlendEnabled(true);



PassNode node = new PassNode("AlphaPass");

node.attachChild(b);



PassNodeState state1 = new PassNodeState();

state1.setPassState(ts1);

node.addPass(state1);



PassNodeState state2 = new PassNodeState();

state2.setPassState(ts2);

state2.setPassState(bs);

node.addPass(state2);



rootNode.attachChild(node);



RenderPass pass = new RenderPass();

pass.add(node);

pManager.add(pass);





edit: I tried some fun-stuff and added 40 TextureStates to a scene with 26k tris. The result were 551.000 triangles with a massive bunch of alpha-calculations and hey: 28fps. Now I'm sure the JME-Engine IS fast.