[SOLVED] Heatmap vertex color problem

Troubleshooting graphics
21

You said that i could still do it with custom meshes. Do you know how i could do a mesh which consits of 4 patches. Or what do i have to do for the mesh to go over the whole terrain.

22

consits of 4 patches

well not sure what you mean.

Anyway i just made a simple shader:

is this video what you want?

in vertex shader:

varying float height;

and:

vec4 modelSpacePos = vec4(inPosition, 1.0);
gl_Position = TransformWorldViewProjection(modelSpacePos);
texCoord = inTexCoord;
wPosition = TransformWorld(modelSpacePos).xyz;

and:

height = wPosition.y;

in fragment shader:

varying float height;

and:

gl_FragColor.rgb = vec3(height/50,0,0);

(50 value depends)

23

Yes that’s what i want. :+1:
Only that the coords of the “Mountains” is being applied from the database and not by mouseclick.

And with shaders would there be a possibility to make it fade from green to red?

Where should i implement the code you wrote?

24

you can look at JME tutorials about JME Terrain, (in forum on left up is Wiki, search there)

so instead of loading heightmap from image/file you do it like:

AbstractHeightMap heightmap = new AbstractHeightMap() {
    @Override
    public boolean load() {
        size = terrainSize;
        // clean up data if needed.
        if (null != heightData) {
            unloadHeightMap();
        }
            heightData = new float[size * size];
            // transfer temporary buffer to final heightmap
            for (int i = 0; i < size; i++) {
                for (int j = 0; j < size; j++) {
                    setHeightAtPoint(GETYOURHEIGHT(j,i), j, i);
                }
            }
            normalizeTerrain(NORMALIZE_RANGE);
        }
        return true;
    }
};
heightmap.load();

where:

setHeightAtPoint(GETYOURHEIGHT(j,i), j, i);

GETYOURHEIGHT will be some of your method that get height for j,i coords

25

So should i put the AbstractHeightMap into the constructor?

What am i supposed to do with the vertex and fragment shaders, or where should i put the things that you wrote there

I’m a bit confused right now :smiley:

26

Where should i implement the code you wrote?

well i cant do all school project for you, because it would be not fair :slight_smile:

  • everything you have in wiki or in forum posts. like i said when you will look at JME Terrain Wiki -you will know where you need put this code.
  • Also when you will look at simple shaders, you will know where put this lines too.

And with shaders would there be a possibility to make it fade from green to red?

just change line about color to:

gl_FragColor.rgb = vec3(height/20,1 - height/20,0);

video:

1 Like
27

Thank you :slight_smile:

Is there any difference when doing it with the mouse or just putting in coordinates in the heightmap?

Ill try to find out where I have to put the lines in, wish me luck :smiley:

28

no there is no difference.

the only difference as you see i got there “Grid” and i got bloom filter that make tip of mountain yellow color arround. you dont need it and you will not have it so dont worry.

29

How do i get the bloom filter with the yellow color?
I think it makes the whole heatmap better.

Again a big thank you for your help :pray:

30 
    FilterPostProcessor fpp = new FilterPostProcessor(assetManager);
    viewPort.addProcessor(fpp);
    BloomFilter bloom = new BloomFilter(BloomFilter.GlowMode.Scene);
    bloom.setExposurePower(80);
    bloom.setBloomIntensity(3f);
    bloom.setDownSamplingFactor(1.5f);
    bloom.setBlurScale(2f);
    bloom.setExposureCutOff(0);
    fpp.addFilter(bloom);

just put this in simpleInitApp, should work fine. Anyway i dont think its proper for heightmap :slight_smile:

if you need yellow color between green / red, you need again change:

gl_FragColor.rgb = vec3(height/20,1 - height/20,0);

and setup color you need.

31

I cant say it enough THANK YOU :heart: