Optimum size for meshes?
Blitz3D Forums/Blitz3D Programming/Optimum size for meshes?
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| i was thinking(grind crunch grind crunch) what is the optimum scale factor for levels and models? take a quake style game with the character (for a reference) as 1*2*1 blitz basic single units? Is it more efficient to rendering to scale everything up or not? |
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| I tend to use a scale that is handled well in the modelling package I use which means walls are 32*32*32 units in my dungeon master type project and the player is 24 units high. |
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| Is your player a Giant? :P |
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| Doh! there's a plot leak if ever I saw one! Not! ;) |
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| I use 1 unit = 1 meter, which was recommended to me by some people on this forum. |
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| I guess it would depend a lot on the LOD or polycount of your models. Providing the scale is consistent, it shouldn't make a difference at all as Blitz-Units are completely arbitrary. |
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| Scaling's entirely relative. A base unit of 0.001, 1.0, or 10000, makes no difference to performance. |
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| Too small or high scales may result in floaing point inaccuracy in extreme situations. I try to use 1 unit= 1 meter, but usually I have to correct things a bit, like when the doors are too small, I scale the level up by the factor of 2 or so. |
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| Its ridiculous talking of Blitz-Units = metres etc. My game may be about microbes where one Blitz unit may be effectively = 2.763 microns or something. Someone else's game may be set in space where a standard, non-scaled, primitive sphere represents a planet thousands of miles in diameter. UNITS are arbitrary. The important thing to remember is to beware of the size of steps of movement and the range of the camera with relation to the size and spacing of objects within your world. This way, floating point errors and z-buffer problems can be avoided. ideally, some ratios to use as guidelines for 'safe' performance: Camera Range 1 -> 1000 Mesh Size 1 - 20 Movement Step Size 0.1 - 10 Mesh Positioning 0.1 - 1000 |
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| Its ridiculous talking of Blitz-Units = metres etc. In some cases, yes. But most of the time, it is still a very good convention, because you can easily relate to it. If I want to place two persons with a certain distance them, I don't want to think "ooh I want about 3.5 meters between them, so with my scaling system, I have to multiply that with 32, ..." or "this building will be 8 meters high, so that's 256 units" or whatever... it's easier just placing them 3.5 units away from eachother, and making the building 8 units high, isn't it? |
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