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Terrain - RayCast - Facet Data - MixMap?


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Hello, Raycast TerrainMap and get MixMap %'s?

   CONTEXT: Raycast over a Terrain Map... and determine the type of terrain (floor, rock, grass, etc) where the Ray Intersects mesh.

    Looking at Mixed-Map-Materials and Facet-Data... 

     QUESTION:  is there a way, to get the MixMap through a Raycast  Intersection?

      Or any suggestions on detecting floor, rock, grass... thx.

Kind regards,

UPDATE: using this playground, stepping into raycast... http://www.babylonjs-playground.com/#7CPS7

Found: results[0].pickedMesh, pickedPoint, collisionGroup,   looking around... : )


DEMO-TEST: fork Multi-Map playground and add the touch raycast. : )

Worked perfectly - Clickable Multi Map playground (debugger on cast): https://www.babylonjs-playground.com/#E6OZX#7

looking around... 



UPDATE: idea of how to do this, need to get the mixmap.png rgb at the location of the getTextureCoordinates()...greatest intensity wins.

And... looks like Context2D can do that... (perhaps) https://www.babylonjs-playground.com/#1UCP5L#5



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SOLVED: https://www.babylonjs-playground.com/#PGIYP3

Solution involves some pixel-trickery (with Canvas2D):

- pick

- pickResult.getTextureCoordinates()

- MixMap.png initialized into Canvas2D to calculate the RGB at coordinate

- calculate coordinate = RGB

By evaluating the RGB it can be determined what surface we are on.


 Anyone know a better way?


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  • 2 weeks later...

Thank you @Deltakosh  the solution is cool!

For others googlers, here is the way to get (inferrred) rgb meta data from mix map pixel luminosity!

        if (pickInfo.hit) {
            let uv = pickInfo.getTextureCoordinates();
            let pixel = getImageDataPixelAtUV(impactImageData, uv.x, uv.y);
            //THIS PIXEL gives you color of the Point on the MixMap, so greatest of RGB numbers is the material on the map.


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