Editing WoW:SetTexCoord Transformations (section)

====Example function====
The function below will take a texture t, and a matrix with 6 variables as its arguments, and apply the transformation to the texture using the SetTexCoord calculations above.
 function setCoords(t, A, B, C, D, E, F)
 	local det = A*E - B*D;
 	local ULx, ULy, LLx, LLy, URx, URy, LRx, LRy;
 	
 	ULx, ULy = ( B*F - C*E ) / det, ( -(A*F) + C*D ) / det;
 	LLx, LLy = ( -B + B*F - C*E ) / det, ( A - A*F + C*D ) / det;
 	URx, URy = ( E + B*F - C*E ) / det, ( -D - A*F + C*D ) / det;
 	LRx, LRy = ( E - B + B*F - C*E ) / det, ( -D + A -(A*F) + C*D ) / det;
 	
 	t:SetTexCoord(ULx, ULy, LLx, LLy, URx, URy, LRx, LRy);
 end
Applying transformations is then rather simple. To apply a rotation to the texture, we can use the rotation matrix below (assuming angle a):
{|
|(||cos(a)||sin(a)||1||)
|-
|(||-sin(a)||cos(a)||1||)
|}
Applying a rotation of 90 degrees can then be done by using:
 local cos, sin = math.cos, math.sin;
 local angle = math.rad(90);
 setCoords(texture, cos(angle), sin(angle), 1, -sin(angle), cos(angle), 1);