Show projected 'cursor' on mesh surface

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You can consider using CustomMaterial or PBRCustomMaterial if your mesh is already using StandardMaterial or PBRMaterial.

Please find the documentation for custom material.

CustomMaterial Samples

hi i start write some documentation here for custom material ( its realy easy for me to make it here but i can move it in documentation after that complete ) definition : Custom Material inherited from stable version of Standard material (a carbon Copy of BABYLON.StandarMaterial) when we need CustomMaterial ? : any time you wanna make any custom option but you can’t manage that in standard material . vertex shader definitions : position(readonly) or positionUpdated(vec3) : local position pe…

The part you might need is Fragment_Before_FragColor. You can pass where you want the highlight as a 3D coordinate as uniform input. And then you can modify the color you want to highlight for the area close to the input 3D coordinate.