Graphics Programs Reference
In-Depth Information
1 Working with an established perspective.
In order to add new elements to this photo,
McGarry needed to find a way to fit a two-point grid to this uneven perspective. Us-
ing the Perspective Grid tool, he first grabbed the Ground Level control point and
moved the entire grid so that the three-plane intersection point rested at the fore-
most point on the device. McGarry then needed to adjust the grid to the photo per-
spective. He began by identifying two parallel edges on the left side of the device. To
use these edges as a guide, he used the Line tool to draw two lines along these edges,
extending the lines into the background until they intersected (see heavy pink lines
in image
Pink lines
). This gave him the left vanishing point. He then used the Per-
spective Grid tool to grab the Horizon Line control point and move the horizon line
up to meet the intersection point of the two guide lines.
Since the right plane of the device is essentially rounded with no straight edges to
reference for guide lines, McGarry took the foremost straight edge on the top surface
(heavy blue line in image) and extended a line back to intersect the horizon line,
which gave him the right vanishing point. Since the horizon line was already in
position only one guideline was needed for this side.
1
(Top) The original product; (directly above) shown after drawing
two pink lines on the left side, extending back
until they intersect to form the left vanishing
point, and relocating the horizon line to this
point using the Perspective Grid tool
