Specifying 3D points in 2D graphic displays.

摘要

The invention relates to the correlation of two-dimensional displayed points of an axonometric projection with corresponding three-dimensional points of the projected shapes. A point on a display screen surface is selected and the screen coordinates of the points of the three-dimensional shape are found by converting successive points of the shape to two-dimensional screen equivalents. Comparing the converted coordinates to those of the selected point identifies the shape point corresponding to the selected shape. <IMAGE>