8

Fire Environment Effect 275
Shape group
You control the shape, scale, and pattern of flames
within the fire effect us ing controls u nder Shape.
Two options set the direction and general shape
of flames.
Tendril—Creates directional pointed flames w ith
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 Tendr i l flames,
butyoucanuseittogiveFireballsanovalshape.
Values 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 sca le
to change the boundary of the effect and scale the
shape of the flames.
Use the Stretch p arameter to scale only the
flames inside the apparatus. You can a lso use
Stretch values to reverse the effect that sca ling the
apparatus had on the flames.
Effect of changing Stretch
Value=0.5, 1.0, 3.0
Non-uniform scaling of an apparatu s
Stretch=0.5, 1.0, 3.0
Regularity—Modifies how the flames fill 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 stil l very noticeable.
A value of 0.0 produces a very irregular effect that
might occasionally reach the boundary of the
apparatus, but usually gets tr immed back and is
smaller.
Effect of ch anging Regularity
Value=0.2, 0.5, 1.0