Vertex Weight (mathematical explanation)

[Anonymous]

Hi! Could you tell me please where can I find the information with the mathematical explanation of how the distribution of vertex weights is working in 3ds max ( I need to export the entire animation to a text file, I can export the bip animation matrixes, but the problem is that I don't know where is the txt information about attaching skin to bip). Thank you in advance!

[ads_royje · Accepted solution]

Hi @Anonymous,

this information is found in Skin modifier.

In Max, I added a video that displays that.

In Skin Modifier, there is a Weight table (Vertex weight per bone)

In Skin modifier you can find 2 relevant information:

In Advanced Parameters > Bone Affect Limit (default set to 20)

This is the amount of bones that can affect a single vertex.

In Parameters > Weight Properties > Weight table.

You can find what vertex is assigned to which bones and their weights.

The weight is a Normalized value (adds up to 1.0).

The weight is the percentage of the Bone matrix to affect the vertex.

For instance, a vertex with a weight of 1.0 (considered rigid) will receive 100% of the bone's tranform

A vertex assigned to 2 bones; 0.25 and.0.75 will end up being that the vertex transform will be of 25% of the first and 75% of the second bone.

I hope this can help! 🙂

[Anonymous]

Thank you very much for your help!