Questions about scale of the game area

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#1

Two question about scale and performance:

I. Game area scale - If Physics is not used, is there a difference if game area is:

  • 100 x 100. Then player movement step - 1.
  • or 1 x 1. At this area, player movement step will be - 0.01

Is there a difference in performance between integer and float coordinates?

II. I read somewhere in the forum that models should not be scaled for better performance. Is this true? Or doesn’t matters?

#2

In JavaScript, you don’t have Integer and Float types. You just have ‘Numbers’. Which are double precision floating point values, I believe. I don’t think model scale or scene size is related to performance per se. It’s more a question of precision. As numbers get very large, floating point rounding errors can creep in and you start to notice problem.

Here’s an example from @Crefossus:

There you see an object moving far away from the origin. This results in vertex transformation losing precision in the vertex shader.

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