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#ActualEddieV223

Posted 03 October 2012 - 11:41 PM

Uh, the file format will have zero impact in actual rendering performance, as the model will be converted to the program's internal format regardless of the original format. As for loading performance, it really depends, binary formats are usually the fastest, and also take the least space on disk, but are comparatively much harder to parse.

For instance, many people use .obj not because it is fast, but because it is very easy to parse, readily editable by any text editor, and is usually good enough for most models even if it is quite wasteful in terms of storage. But loading the same model from a .obj and from a .3ds will yield the exact same model representation in your game's memory and there will be no performance difference after loading is complete.


This is not always the case. For example, if there needs to be a file loaded during run time. Such as a cache miss, if you are running low on resources, your cache may not load some resources until it needs it at run time, or may unload something to make room for a different resource. This causes a load during run time and can effect performance. It can be avoided most of the time in a well written cache system but not always.

Even triple A games suffer cache misses occasionally.

So in this scenario a 3d binary format will effect performance far less, than a slower to load exchange format.

So like I said it depends on the internals of what your program is doing under the hood with resources.

#3EddieV223

Posted 03 October 2012 - 11:05 PM

Uh, the file format will have zero impact in actual rendering performance, as the model will be converted to the program's internal format regardless of the original format. As for loading performance, it really depends, binary formats are usually the fastest, and also take the least space on disk, but are comparatively much harder to parse.

For instance, many people use .obj not because it is fast, but because it is very easy to parse, readily editable by any text editor, and is usually good enough for most models even if it is quite wasteful in terms of storage. But loading the same model from a .obj and from a .3ds will yield the exact same model representation in your game's memory and there will be no performance difference after loading is complete.


This is not always the case. For example, if there needs to be a file loaded during run time. Such as a cache miss, if you are running low on resources, your cache may not load some resources until it needs it at run time, or may unload something to make room for a different resource. This causes a load during run time and can effect performance. It can be avoided most of the time in a well written cache system but not always.

Even triple A games suffer cache misses occasionally.

So in this scenario a 3d binary format will effect performance far less, than a slower to load exchange format.

So like I said it depends on the internals of what your program is doing under the hood with resources.

#2EddieV223

Posted 03 October 2012 - 11:03 PM

Uh, the file format will have zero impact in actual rendering performance, as the model will be converted to the program's internal format regardless of the original format. As for loading performance, it really depends, binary formats are usually the fastest, and also take the least space on disk, but are comparatively much harder to parse.

For instance, many people use .obj not because it is fast, but because it is very easy to parse, readily editable by any text editor, and is usually good enough for most models even if it is quite wasteful in terms of storage. But loading the same model from a .obj and from a .3ds will yield the exact same model representation in your game's memory and there will be no performance difference after loading is complete.


This is not always the case. For example, if there needs to be a file loaded during run time. Such as a cache miss, if you are running low on resources, your cache may not load some resources until it needs it at run time, or may unload something to make room for a different resource. This causes a load during run time and can effect performance. It can be avoided most of the time in a well written cache system but not always.

Even triple A games suffer cache misses occasionally.

So in this scenario a 3d binary format will effect performance far less, than a slower to load exchange format.

#1EddieV223

Posted 03 October 2012 - 11:00 PM

Uh, the file format will have zero impact in actual rendering performance, as the model will be converted to the program's internal format regardless of the original format. As for loading performance, it really depends, binary formats are usually the fastest, and also take the least space on disk, but are comparatively much harder to parse.

For instance, many people use .obj not because it is fast, but because it is very easy to parse, readily editable by any text editor, and is usually good enough for most models even if it is quite wasteful in terms of storage. But loading the same model from a .obj and from a .3ds will yield the exact same model representation in your game's memory and there will be no performance difference after loading is complete.


This is not always the case. In the scenario I was talking about. That scenario being if there needs to be a file loaded during run time. Such as a cache miss, if you are running low on resources, your cache may not load some resources until it needs it at runtime, or may unload something to make room for a different resource. This causes a load during run time and can effect performance. It can be avoided most of the time in a well written system but not always.

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