Hello,
I’m having trouble getting Per-Pixel Lighting to work properly on simple geometries with a low vertex density.
Here are a few images to illustrate the problem:
^ The corners of the geometry get light applied mostly correct (a point light is always near the camera location)
^ As the light (and camera) moves towards the center of the wall the light diminishes unnaturally (still at about the same distance to the wall as before, just moved slightly to the right)
^ On the other end of the wall (light and camera moved further to the right) the light is appearing strong again
^ And here is a wireframe of this simple geometry setup (moved the camera a bit backwards)
So apperently the light contributes to the walls material only at the edges of the geometry, where there are vertices nearby.
This looks like Vertex Lighting to me and I just can’t figure out how to do proper Pixel Lighting using JME’s Lighting.j3md.
Here is how I set up the material:
// Material
blockMaterial = new Material( assetManager, "Common/MatDefs/Light/Lighting.j3md" );
Texture texture = assetManager.loadTexture( "Textures/Ground.png" );
texture.setWrap( Texture.WrapMode.Repeat );
blockMaterial.setTexture( "DiffuseMap", texture );
blockMaterial.setColor( "Diffuse", ColorRGBA.White );
blockMaterial.setColor( "Specular", ColorRGBA.White );
blockMaterial.setFloat( "Shininess", 32.0f );
blockMaterial.setBoolean( "VertexLighting", false );
blockMaterial.setBoolean( "UseVertexColor", false );
And here is how I create the point light:
testlight = new PointLight( player.position, new ColorRGBA( 10.0f, 10.0f, 10.0f, 1.0f ), 164.0f );
rootNode.addLight( testlight );
I have exaggerated the light color intensity a bit, because it makes the issue more clear visually.
The lights radius is quite high because the geometries are also fairly large (the wall is about 256.0 world units wide).
I have also prepared a little test case (based on jmonkeyengine/TestLightRadius.java at master · jMonkeyEngine/jmonkeyengine · GitHub):
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package main;
import com.jme3.app.SimpleApplication;
import com.jme3.light.DirectionalLight;
import com.jme3.light.PointLight;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;
import com.jme3.scene.shape.Sphere;
import com.jme3.scene.shape.Torus;
public class TestLightRadius extends SimpleApplication {
float pos, vel=1;
PointLight pl;
Geometry lightMdl;
public static void main(String[] args){
TestLightRadius app = new TestLightRadius();
app.start();
}
@Override
public void simpleInitApp() {
viewPort.setBackgroundColor( ColorRGBA.Blue );
Torus torus = new Torus(10, 6, 1, 3);
// Torus torus = new Torus(50, 30, 1, 3);
//Geometry g = new Geometry("Torus Geom", torus);
Geometry g = new Geometry( "Geom", new Box( 10, 1, 2 ) );
//g.rotate(-FastMath.HALF_PI, 0, 0);
g.center();
// g.move(0, 1, 0);
Material mat = new Material(assetManager, "Common/MatDefs/Light/Lighting.j3md");
mat.setFloat("Shininess", 32f);
mat.setBoolean("UseMaterialColors", true);
mat.setColor("Ambient", ColorRGBA.Black);
mat.setColor("Diffuse", ColorRGBA.White);
mat.setColor("Specular", ColorRGBA.White);
// mat.setBoolean("VertexLighting", true);
// mat.setBoolean("LowQuality", true);
g.setMaterial(mat);
rootNode.attachChild(g);
lightMdl = new Geometry("Light", new Sphere(10, 10, 0.1f));
lightMdl.setMaterial(assetManager.loadMaterial("Common/Materials/RedColor.j3m"));
rootNode.attachChild(lightMdl);
pl = new PointLight();
pl.setColor(ColorRGBA.Green);
pl.setRadius(4f);
rootNode.addLight(pl);
DirectionalLight dl = new DirectionalLight();
dl.setColor(ColorRGBA.Red);
dl.setDirection(new Vector3f(0, 1, 0));
rootNode.addLight(dl);
}
@Override
public void simpleUpdate(float tpf){
// cam.setLocation(new Vector3f(5.0347548f, 6.6481347f, 3.74853f));
// cam.setRotation(new Quaternion(-0.19183293f, 0.80776674f, -0.37974006f, -0.40805697f));
pos += tpf * vel * 5f;
if (pos > 15){
vel *= -1;
}else if (pos < -15){
vel *= -1;
}
pl.setPosition(new Vector3f(pos, 2, 0));
lightMdl.setLocalTranslation(pl.getPosition());
}
}
As you can see the moving point light contributes light to the boxes material unevenly, similar to Vertex Lighting.
Does anybody know how I could setup my materials and lights so that I get proper per pixel / fragment lighting in my scene?
Am I missing a material parameter?
