Material Array not updating

[notchris]

Describe the bug
Had a mesh with multiple materials in array / names format. When changing a material by index, the mesh did not display the new materials when render updated. Tried setting .needsUpdate on each material inst in the array.

[h-ikeda]

Like vm.materials[0] = newMaterial ?
There is a restriction caused by Vue.js.
https://vuejs.org/v2/guide/reactivity.html#For-Arrays

Please try to use vm.$set() method or Array.prototype.splice() method.

[notchris]

@h-ikeda I will try this and report back, thank you.