Shape Key decimate modifier I am trying to morph a high poly humanoid into a low poly humanoid, animating the decimation. As far as I know this cannot be done with the Decimate Modifier. I have also tried doing this by using shape keys and applying 'limited dissolve' while in edit mode, without success.

Would anyone know a work around to create a high to low poly animation?

Thanks!
Shape keys in blender allows you to translate and  scale different vertices, edges and faces of a mesh. Even though Shape keys changes the structure/geometry of a mesh, they always maintain the same number of polygons.

So any changes involving changes in poly count usually won't work well for Shape Keys. So for this situation, Shape Keys cannot be used.

However,you could try animating the iterations/ratio/angle limit of the decimate modifier. Just press i on a slider and the slider turns yellow which means the slider is Keyframed.