Light

Troubleshooting graphics
1

I need to know how to create a light bulb. This would be for blinking lights on a helicopter. Right now I am using a PointLight which is how I created it in JME 1 but now the light only illuminates when the scene light is pointing on it. If its not pointing on it its gray or black. I need it to be lit even in a dark scene. Also I used a controller before to turn the light on and off by setting the enabled to false then back to true in a timed interval. Setting the light enabled to false doesn’t do anything. I am using JME3 r6518.



Here is a code sample.



pre type="java"
ColorRGBA lightColor = (vertex.validColor()) ? vertex.getPackedColor() : new ColorRGBA(1,1,1,1);


        ColorRGBA frontIntensityColor = lightColor.multLocal(intensityFront);


        Point point = new Point(vertex.getCoord(), vertex.getNormal());





PointLight light = new PointLight();


         light.setColor(frontIntensityColor);


         light.setPosition(new Vector3f(vertex.getNormal()));


         light.setRadius(actualPixelSize  180f);


         light.setEnabled(true);


         point.setPointSize(actualPixelSize  20f);


        lightGeom = new FlightGeom(id + “_omnilight”,point);


        lightGeom.addLight(light);





Material material = new Material(doc.assetManager,“Common/MatDefs/Light/Lighting.j3md”);


        material.setFloat(“Shininess”, Float.MAX_VALUE);


        material.setBoolean(“UseMaterialColors”, true);


        material.setColor(“Ambient”,  frontIntensityColor);


        material.setColor(“Diffuse”,  frontIntensityColor);


        material.setColor(“Specular”, ColorRGBA.White);


        material.getAdditionalRenderState().setFaceCullMode(FaceCullMode.Off);


        lightGeom.setMaterial(material);


        lightGeom.setModelBound(new BoundingSphere());


        lightGeom.updateModelBound();


        ((Node)node).attachChild(lightGeom);


       





        // if the flashing or rotating bit is set in the flags, add a blink sequence


        if (((flags & FLASHING) != 0) || ((flags & ROTATING) != 0)){


         LightAnimationController nac;


nac = new LightAnimationController(node,id,animationPeriodEnable,animationPeriod,-1,1.0f,(animationPeriod - animationPeriodEnable), doc);


node.addControl(nac);


        }
/pre

2

Instead creating a point light and attach it to the lightGeom you could use glow map.

edit : or glow color.

3

For the light, you can use the unshaded material so it is not effected by lighting

4

@Momoko_Fan: The only way to “cast light” to a geom with an unshaded material is using light map, right?

5

What is the point in even having the light then. I can comment the addLight code out when using the unshaded and its no different than having the light. Also why does the setEnabled not work. If I set the light to enabled false. The material overrides it if it does work. It still lights up.

6

Yes

7
andy_g said:
...but now the light only illuminates when the scene light is pointing on it. If its not pointing on it its gray or black...


Thus I think you will never see the lightGeom outside lights up, independently of the face cull mode. Did you try the unshaded material with glow map or glow color?
8

Is there any way to create a light and be able to turn it on and off? I am having to switch the material from the desired color to black to give the illusion the light is blinking.

9
andy_g said:
Is there any way to create a light and be able to turn it on and off?


By adding and removing it from its parent.
10

I have tried it with unshaded and glow color. The geometry is all white. I do not have a texture so there is no need for glowmap.

11
andy_g said:
I have tried it with unshaded and glow color. The geometry is all white. I do not have a texture so there is no need for glowmap.

And what color did you want :??
Control the glow effect with a bloom filter : https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:advanced:bloom_and_glow
12

I got the glow color working and like the way the bloom works but I have a problem the bloom glows through other models, terrain and buildings if the model is located behind one of these. Not good.

Is there a setting that keep it from having this behavior?

13

I don’t know, but looking at your code you shouldn’t add the point light to the lightGeom, you should add it to the rootNode and keep them in the same location instead.

[java]

public void simpleInitApp() {

…

rootNode.add(lightGeom);

Vector3f loc = lightGeom.getLocalTranslation();

PointLight light = new PointLight();

light.setLocation(loc);

rootNode.addLight(light);

…

}



public void simpleUpdate() {

//do something here to keep them in the same location

}

[/java]