MeshBlend

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Rules of Blending ​

At it's core the MeshBlend shader works on a grayscale mask where each mesh has a value (0 - 255). Encoded in this is the blend size (small, medium, large, extra large) and the blend ID.

Standard
MeshBlend

This means a couple of things ​

  • Each blend size has a maximun 63 unique IDs. Meaning two meshes that overlap can theoretically get the same ID, and their seam won't blend. But in practice this is very rare.

  • The system calculates an available blend ID based on the bounds of all the meshes overlapping it. This means that if a mesh that is blended is moving around, the chance for it to intersect with something that has the same ID is higher.
    There is helper function to recalculate a blend ID at runtime if needed, and there are also 5 static ID's per blend size that can be used for special cases.

Other notes ​

Different blend sizes in debug view

  • The blend size is always the smallest of the two intersecting sizes. A landscape set to Large blend with a pebble set to small will result in a small blend between the two.