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Comments on How to proportionally convert a number in the range of -1 and 1 to a number in the range of 0 and 319

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How to proportionally convert a number in the range of -1 and 1 to a number in the range of 0 and 319

+3
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I have float noise values, between -1 and 1, for every x,y coordinate in a 2D area and I am trying to convert that to a whole number between 0 and 319 which represents a vertical z coordinate to render.

For example,

-1 = 0 and   
1 = 319 but    
0.12345 = ???

How would I go about implementing this efficiently?

java 3d math
posted almost 2 years ago
2y ago
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cuzzo‭
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2 comment threads

How many such conversions are required (3 comments)
Not sure if I understood entirely your question, but it seems to boil down to a simple set of equatio... (1 comment)
How many such conversions are required
Alexei‭ wrote almost 2 years ago
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How many such points do you have? I guess the answer depends a lot if we are talking about thousands vs. millions.

cuzzo‭ wrote almost 2 years ago
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anywhere from 768 to a few/several thousand. It can range based on a render distance value e.g how many chunks to render at one time. chunks being 16x16x320 and having 256 unique 2D x,y values (16x16).

Alexei‭ wrote almost 2 years ago
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A few/several thousand should be computed fast enough by "normal" (not involving more specialized hardware) math (i.e. using the CPU), that is solving those two equations mentioned in the other thread: computing a and b from your linear function f(x) = a*x + b.