As Smallg said:
Box Collision = A single box around the whole model
Polygon Collision = A box that conforms to the shape of the model and it's polygons
User Defined Collision = A series of boxes you define yourself
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.
