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johan_swe

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Does it matter how big 3d-objects are? Ss there any difference if you let 1 d3d unit be equavalent to 1 meter or 10 meters irl?

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No it does not matter, as long as everything is on the same scale (or else you get skyscraper-climbing giant killer kittens).

And also make sure your far plane/near plane ratio is small enough (below 50-100).

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I would stick to units that are within somewhat realistic range. Otherwise, you''ll start hitting z-buffer precision limitations that ToohrVyk mentioned. For example, if your view frustrum is 1-1000000 because objects are millions of units apart from each other, then you might end up with weird clipping artifacts.

For convienence, I use 1 unit = 1 meter real world, because the modeling software I use defaults to the same ratio.

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