9

Fire Environment Effect 279
Shape group
You control the shape, scale, and p attern of flames
within the fire effect u sing controls under Shape.
Two options set the direction and general shape
of flames.
Tendril—Creates directional pointed flames with
veinsalongtheircenter.Theflamesorientalong
the local Z axis of the fire apparatus. Tendril
creates campfire-like flames.
Fireball—Createsroundpuffyflames.Fireballsare
well suited for explosions.
Comparing Tendril to Fireball
Above=Tendril, Below=Fireball
Stretch—Scales flames along the Z axis of the
apparatus. Stretch works best with Tendril flames,
butyoucanuseittogiveFireballsanovalshape.
Va lues less than 1.0 compress flames, making them
shorter and thicker.
Values greater than 1.0 stretch flames, making
them long and skinny.
You can combine Stretch with non-uniform
scaling of the apparatus. Use non-uniform scale
to change the boundary of the effect and sca le the
shape of the flame s.
Use the Stretch parameter to scale only the
flames inside the apparatus. You can also use
Stretch values to reverse the effect that scaling the
apparatus had on the flames.
Effect of changing Stretch
Value=0.5, 1.0, 3.0
Non-uniform scaling of an apparatus
Stretch=0.5, 1.0, 3.0
Regularity—Modifies how the flames fi ll the
apparatus. Range=1.0 to 0.0.
A value of 1.0 completely fills the apparatus. The
effect fades near the edges of the apparatus, but the
overal l shape is still very noticeable.
A value of 0.0 produces a very irregular effect that
might occasionally reach the boundary of the
apparatus, but usually gets trimmed back a nd is
smaller.
Effect of changing Regularity
Value=0.2, 0.5, 1.0