Kev,
Looking at your drawings it looks like you've quickly grasped the basics of two-point projection. As you've discovered, an isometric drawing is a perspective approximation. The beauty of the isometric projection is that depths as well as long dimensions are equal to the plan view dimensions. It makes drawing a "pseudo perspective" drawing relatively quick, such as for parts catalog illustrations. Isometric projection has it's limitations however, such as the inability to always discern relative displacement in the Z axis.
If you don't already have it, buy a copy of French and Vierck's "Engineering Drawing and Graphic Technology" Besides being the best text on engineering drawing ever written, it has a good section on perspective. Also, any good book on technical illustration will cover perspective in detail.
In your last drawing, your sketch work is coming along well!
P.S. Go to ebay and pick up a set of ellipse templates and an ellipse wheel. The ellipse and triangle are the fundamental shapes of perspective. An ellipse is a conic section - a circle on edge.
Looking at your drawings it looks like you've quickly grasped the basics of two-point projection. As you've discovered, an isometric drawing is a perspective approximation. The beauty of the isometric projection is that depths as well as long dimensions are equal to the plan view dimensions. It makes drawing a "pseudo perspective" drawing relatively quick, such as for parts catalog illustrations. Isometric projection has it's limitations however, such as the inability to always discern relative displacement in the Z axis.
If you don't already have it, buy a copy of French and Vierck's "Engineering Drawing and Graphic Technology" Besides being the best text on engineering drawing ever written, it has a good section on perspective. Also, any good book on technical illustration will cover perspective in detail.
In your last drawing, your sketch work is coming along well!
P.S. Go to ebay and pick up a set of ellipse templates and an ellipse wheel. The ellipse and triangle are the fundamental shapes of perspective. An ellipse is a conic section - a circle on edge.