My model has a texture with certain transparent areas (alpha equals zero).
But when the model casts a shadow, it looks like it's solid.
Is there a way to solve this issue?
My model has a texture with certain transparent areas (alpha equals zero).
But when the model casts a shadow, it looks like it's solid.
Is there a way to solve this issue?
When working with shadows in three.js, meshes are considered solid when viewed from the perspective of the light source.
However, if your mesh contains a transparent texture or an alpha map, you can achieve more accurate shadows by using a CustomDepthMaterial for the mesh.
There are multiple methods to accomplish this, one of which involves utilizing a custom ShaderMaterial. An example of this approach can be found in this specific three.js demonstration.
https://i.sstatic.net/tEuQH.png
For simpler scenes, a common pattern to follow is:
var customDepthMaterial = new THREE.MeshDepthMaterial( {
depthPacking: THREE.RGBADepthPacking,
map: myTexture, // alternatively, alphaMap: myAlphaMap
alphaTest: 0.5
} );
mesh.customDepthMaterial = customDepthMaterial;
Version used: three.js r.85
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