BILERP

THE BOX'S MAIN HELP:

This functon returns float which is a bilinear interpolation
between the four corners (S1,T1,S2,T2) in texture space 
to the given point (U,V) in parameter space.

U (input):

This must be a float.
U coordinate of the point to interpolate in parameter space.

V (input):

This must be a float.
V coordinate of the point to interpolate in parameter space.

S1 (input):

This must be a float.  First corner of the area in texture space.

T1 (input):

This must be a float.  Second corner of the area in texture space.

S2 (input):

This must be a float.  Third corner of the area in texture space.

T2 (input):

This must be a float.  Fourth corner of the area in texture space.

OUT (output):

Returns float which is a bilinear interpolation
between the four corners (S1,T1,S2,T2) in texture space 
to the given point (U,V) in parameter space.

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