Tuesday, April 26, 2011
One way to sketch a cube
Sketch a ground line parallel to the bottom of the paper. Sketch in a leading edge perpendicular to that ground line, then draw the bottom of the cube. One line should accelerate back to its vanishing point quicker than the other (the resulting angles are different: x<y).
Pick a height for your cube. Mark it on the leading edge line. Translate the exact length of that line to the bottom edge, come toward the leading edge line to account for the foreshortening that occurs and then sketch a vertical line as the back edge.
Translate the exact length of the leading edge and the midpoint of the leading edge to the bottom edge and mark. The back edge should be in between these marks (more toward the midpoint). Sketch a vertical line as the back edge.
Ghosting over the cube edges that are already there (1+2), turn the page in a rhythm to continue the top back edge (3).
You should notice that you turn the page less for the smaller angled side (this side).
Ghosting over the cube edges that are already there (1+2), turn the page in a rhythm to continue the other top back edge (3).
You should notice that you turn the page more for the bigger angled side (this side).
Adjust the sides of the cube to make it look more like a cube. This takes practice. Sometimes you can spot things better if you hold it upside down. You can also double check your work by doing a reverse draft and making sure your plan is a square.
Go back and darken the edges that you would like the viewer to see.