Add the blending in the switch material

Hi guys at moment the material morphing is possible but not fast. commonly the method is switch every texture via switch top. At moment the Switch MAT have no blending option and could be amazing introduce this option. (Obviously only for same types of materials pbr with pbr, phong with phong, etc…)

Another connected amazing option is the blending with mask (using animation in mask to blend the 2 shaders)