Primitive Forms
Below are rotatable, zoomable, pannable three-dimensional models designed to be used for drawing practice. 
Primitive Forms
Cube
Three-dimensional form that you can rotate and draw.
Randomized Cube
Three-dimensional form that you can rotate and draw.
Perspective Lines For A Box
Practice drawing the ribs so that they align with perspective lines correctly.
Sphere
Three-dimensional form that you can rotate and draw.
Circles And Ellipses
A simple circle in three-dimensional space, drawn with helpful construction lines.
Flattening Planes, Circles
A simple circle in three-dimensional space, rotated in various degrees. Based on the flattening planes warm-up suggested by Brokendraw.
Flattening Planes, Squares
A simple square in three-dimensional space, rotated in various degrees. Based on the flattening planes warm-up suggested by Brokendraw.
Cylinder
Three-dimensional form that you can rotate and draw.
Cone
Three-dimensional form that you can rotate and draw.
Equilateral Triangle Pyramid
Three-dimensional form that you can rotate and draw.
Pyramid
Three-dimensional form that you can rotate and draw.