Is there a way to create a heightmap manually or to access its vertices ?

[altreality]

I want to create the heightmap vertices through code and then pass it to cannon for creating a cannon heightmap as its impostor.  Does the heightmap object in Babylon expose the vertices for filling up procedurally ?

[altreality]

ok, a heightmap is just a Mesh, so its vertices can be got by mesh.getVerticesData(()

[Wingnut]

Hi again AR!  Also, you might want to check out....

https://github.com/BabylonJS/Babylon.js/blob/master/Babylon/Mesh/babylon.mesh.js

line 809 - mesh.applyDisplacementMap()  and  line 834 - mesh.applyDisplacementMapFromBuffer()

I used a slightly modified copy of applyDisplacementMapFromBuffer() in this demo... 

http://playground.babylonjs.com/#P9UZG

I needed to rotate the image around, so I had to hack on the canvas that was being used for the displace.  That's why I used a rogue copy of the function in the playground code... instead of using the default framework version.   But maybe the rogue version was not needed.  I'm not a very good programmer. 

Rogue?  Maybe "vagabond" is a better word. *shrug*

Grab a zip or a copy... have some fun, show us the cool stuff you make.  Fun with heightMapping (from buffers/arrays). 

[altreality]

Thanks Wingnut. So now I am trying to apply a displacement map to get the heights on a ground mesh using mesh.applyDisplacementMapFromBuffer()

http://playground.babylonjs.com/#1AVEYO#2

Any idea why the vertices do not displace ?

[GameMonetize]

You should use a ground with more subdivisions (like var ground = BABYLON.Mesh.CreateGround("ground", 2, 2, 100, scene, true); )

 

And by the way, the buffer should contain a picture with grayscale values. If you want to update a mesh you can use mesh.getVerticesData and mesh.updateVerticesData:

http://pixelcodr.com/tutos/trees/trees.html

[altreality]

ok, here is an updated sample : http://playground.babylonjs.com/#1AVEYO#10

I am using 100 subdivisions now. Still trying to figure this one out. Used  mesh.getVerticesData() to get the vertex data and for setting the data I tried mesh.updateVerticesData and mesh.setVerticesData 

By the way, can the debug layer be modified to show the world axes too ? 

[altreality]

ok got it  http://playground.babylonjs.com/#1AVEYO#13

[GameMonetize]

Good job:)

[bentwonk]

var positions = ground.getVerticesData(BABYLON.VertexBuffer.PositionKind);
var normals =   ground.getVerticesData(BABYLON.VertexBuffer.NormalKind);
var colors =    ground.getVerticesData(BABYLON.VertexBuffer.ColorKind);
var uvs =       ground.getVerticesData(BABYLON.VertexBuffer.UVKind);

var indices =   ground.getIndices();

all return null for me when applied to a height map generated ground.

[GameMonetize]

Hello,

you have to wait for the height map to be loaded. There is a callback in the HeightMapGround constructor (http://doc.babylonjs.com/tutorials/height_map):

var ground = BABYLON.Mesh.CreateGroundFromHeightMap("ground", "worldHeightMap.jpg", 200, 200, 250, 0, 10, scene, false, successCallback);