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Draw calls for multiple object placement.

JGplanes

JGplanes

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unitedstates
I need to place a large amount of identical small items at a small airport. They all have LODs and they disappear at more than 20 meters. If I use an object placement tool to place these, will that require a separate draw call for each object placement, or will it already call the existing texture in the pipeline? Also, how do objects that are set to disappear affect fps? Can I have thousands of them that disappear from a few meters away and it not impact fps?

Thanks,
John
 
Hi,

If you have lods, there is no drawcall batching. Each object is its own drawcall.

Also not drawn objects give an overhead, since the engine has to evaluate to draw them or not.
 
Thanks, Arno.

I placed about 20-30 lights around and didn't notice an fps hit. Now I'll try with 100. :D
 
arno said:
Hi,

If you have lods, there is no drawcall batching. Each object is its own drawcall.

Also not drawn objects give an overhead, since the engine has to evaluate to draw them or not.
Click to expand...

Does it cause overhead even if you tell it to specifically not draw the object at so many meters. I'm grasping for straws here, but wouldn't it only have to check the buffer and replace the object if it were identical. I think maybe I am asking too much of the FSX engine. :confused:

So, I have a 4 poly LOD, a 6 poly LOD, and a 12 poly LOD with one draw call. Wouldn't it be better to just have them disappear at a distance, rather than leave a 1 poly LOD? If I leave a 1 poly LOD from a distance, then does it still have to determine whether/how the object is drawn or not, thus adding overhead anyway?

Sorry for my ramblings. :rolleyes:
 
Hi,

Yes, any lod will give overhead to check. You might want to test without lod to see if the drawcall batching gives you more benefit.
 
I am using Gmax, and if I remember right from another post, Gmax doesn't support batching?
 
Correct. But you can import the model with my ModelConverterX tool and then export in a way that supports the batching.
 
Oh ! ModelConverterX does it :rolleyes:
If your object duplicates several hundred times (ie taxi lighting), batching should give better results.

EDIT: too lazy to answer first...
 
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