Transcript measured perspective curves 1

Department
of
Technological
Education
Graphic Communication
Nairn Academy
Department of Technological Education
Curves in Perspectives
A room view has been drawn
as a Two-point Perspective
view.
VP1
VP1
GL
The room has a bookcase and
a desk shown in position.
Draw the circular rug in place
on the perspective view.
PP
SP
Department of Technological Education
Dividing Circle
Start by dividing the circle for
the rug into 12 separate parts.
VP1
VP1
GL
Try, where possible, to make
sure that when this is done it
lines up with the angle of the
edge of the room – in this
case 45o.
PP
SP
Department of Technological Education
Finding Point 1
For each point it will be
necessary to find a new height
line. The rug sits on the ground
so no height is required, but the
position of the line is important.
Project each point to the PP and
then up to the ground line.
Although VP1 is being used it is
possible to use either of the VP’s
VP1
VP1
GL
PP
Project a line from VP1 through
the newly found height line.
Project a line from the SP
through the required point on
the rug to the PP and then
vertically to cut the line from
VP1.
Mark where the two projected
lines cross with a small dot.
SP
Department of Technological Education
Points 2 + 3
If you have successfully
VP1
managed to line up the
divisions of the circle with the
projection angle you should be
able to find two points at the
same time now.
Project through the next pair
of points to find the new
height line.
VP1
GL
PP
Repeat the process of
projecting through this new
height line point from VP1 and
through the circle points from
the SP to find two new points.
Mark the new points with a
small dot.
SP
Department of Technological Education
Points 4 + 5
Continue this process for each
of the points on the circle.
VP1
VP1
GL
Find the height line
Project from VP1
Project from SP
Mark found point with small
dot
PP
SP
Department of Technological Education
Points 6 + 7
VP1
VP1
GL
PP
SP
Department of Technological Education
Points 8 + 9
VP1
VP1
GL
PP
SP
Department of Technological Education
Points 10 + 11
VP1
VP1
GL
PP
SP
Department of Technological Education
Final Point
VP1
VP1
GL
PP
SP
Department of Technological Education
Drawing Curve
To finish the rug lightly draw a
smooth curve through each of
the points found.
VP1
VP1
GL
If this looks correct darken the
outline to complete the
drawing.
PP
SP
Department of Technological Education
Final Drawing
The final drawing should look
like this.
PowerPoint Presentation produced by John McRae, Nairn Academy 2003