xf.html

MGF Entity xf Return to index

NAME

xf - begin or end transformation context

SYNOPSIS

xf [ transform ]

DESCRIPTION

If a set of transform arguments are given, we push a new transformation context onto the stack. If the xf keyword is given by itself, then we pop the last transformation context off the stack. The total transformation in effect at any given time is computed by prepending each set subcontext arguments onto those of its enclosing context. This and other details about transformation specifications are explained in some detail in section 2.2.2.

The following transformation flags and parameters are defined:

-t dx dy dz: translate objects along the given vector
-rx degrees: rotate objects about the X-axis
-ry degrees: rotate objects about the Y-axis
-rz degrees: rotate objects about the Z-axis
-s scalefactor: scale objects by the given factor
-mx: mirror objects about the Y-Z plane
-my: mirror objects about the X-Z plane
-mz: mirror objects about the X-Y plane
-i N: repeat the following arguments N times
-a N: make an array of N geometric instances

EXAMPLE

# Create 3x5 array of evenly-spaced spheres (grid size = 3)
v vc =
	p 0 0 0
xf -t 1 1 10 -a 3 -t 3 0 0 -a 5 -t 0 3 0
	sph vc .5
xf

xf.html

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