Thread: Procedural landscapes: Total n0ob needs to streamline maths code

I have a code that generates mountain shapes for 10 different 3d maps covering an entire graph, then i delete 90 percent of each map and mix the rest into a final map with a variety of mountain shapes. Therefore processor useage is 9 times inefficent! The code can make infinite variety of basic shapes and mixes.

The graphics engine asks height information for X,Y, and the code returns Z using sine functions.

graph axes X and Y are Floats in the range -1,1.

How can make variables new_X and new_Y that are only segments of X,Y, So that i can code sin(new_X)*sin(new_Y), and it will calculate mountains only in the ranges that will be visible in the final map? for example new_X would be a segment of X in the range (-0.1,0.2) that exists on the X variable.

Thanks!

Sorry i have rewritten the explanation more clearly. the X and Y axes are Floats in the range -1 to 1, but i could convert everything to integer, which i believe is faster on x86. A sin lookup table would be awesome, i will do some reading!

I would still love to know how to make a segments of a variable where code is only processed for those segments, so that you can process different maths on each segment of a variable, rather than having to do the maths on the entire range and then delete the rest and mix the remainder, like how i am doing.