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FSX Large object disappearing too soon

preynolds

preynolds

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unitedkingdom
Hi,

I have a large FSX mdl object (about 800m long) that I've placed in my scenery without any problem. However when moving towards the edge of the object, in certain circumstances it disappears before it's moved out of the FS view.

I'm guessing it's something to do with the size of the bounding box (?) but don't know if I can increase this or whether I need to do something else to fix the issue.

Cheers

Phil
 
Hi,

I have seen this before as well. Where is the origin of your object? Is it in the middle of the object or not?
 
Hi Arno,

The refpoint is in the centre. I loaded the mdl into modelconverterx to take a look at the bounding box. There are three different bounding boxes (one around each "object" in the gmax model) but all parts of the object are within the bounding boxes.

Cheers

Phil
 
Hi Phil,

In the end the MDL file gets one big bounding box. That one is also nicely centered?
 
Large objects will often disappear to early as they approach the edge of the field of view, or the ref-point is not visible.

The solution is to place single triangles underground (ie below the 0 Z-reference plane) in Gmax) beyond the corners of the object

Usually 4 triangles extending the "virtual corners" of the bounding box outwards. They do not have to be continuous with the edge of the mesh.

This will stop the object disappearing when you are close to the edge.
 
Hi,

arno said:
In the end the MDL file gets one big bounding box. That one is also nicely centered?
Click to expand...

There looks to be 3 separate bounding boxes, I've attached a screenshot from modelconverterx.

hcornea said:
The solution is to place single triangles underground (ie below the 0 Z-reference plane) in Gmax) beyond the corners of the object.
Click to expand...

That sounds like a good solution. I'll give it a try later today, thanks.

Phil
 

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Odd to have 3 bounding boxes ... even with LOD's. Does the object have LODs?
 
ModelConverterX shows the bounding box per modelpart as well (although it seems in this case the overal bounding box is missing). If you look in the Object Information form you will see the information of the total bounding box.
 
Hi,

hcornea said:
Odd to have 3 bounding boxes ... even with LOD's. Does the object have LODs?
Click to expand...

No, just the one LOD.

arno said:
ModelConverterX shows the bounding box per modelpart as well (although it seems in this case the overal bounding box is missing). If you look in the Object Information form you will see the information of the total bounding box.
Click to expand...

There is just one object, the 3 bounding boxes match the polys that are textured with different bitmaps (3 bitmaps used). The info for the bounding box in Object Information matches up with the size of the overall object.

Phil
 
hcornea said:
Large objects will often disappear to early as they approach the edge of the field of view, or the ref-point is not visible.

The solution is to place single triangles underground (ie below the 0 Z-reference plane) in Gmax) beyond the corners of the object

Usually 4 triangles extending the "virtual corners" of the bounding box outwards. They do not have to be continuous with the edge of the mesh.

This will stop the object disappearing when you are close to the edge.
Click to expand...

That's a great tip thanks for that! I get this happening from time to time also.
 
hcornea said:
Large objects will often disappear to early as they approach the edge of the field of view, or the ref-point is not visible.

The solution is to place single triangles underground (ie below the 0 Z-reference plane) in Gmax) beyond the corners of the object

Usually 4 triangles extending the "virtual corners" of the bounding box outwards. They do not have to be continuous with the edge of the mesh.

This will stop the object disappearing when you are close to the edge.
Click to expand...

Would this apply to FS9 as well ? if so could you please explain your method of solving this a little more as very new to Gmax.I have some pictures show a very similar thing happening to a model I'm working on,left,front and right view.
 

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notned_247 said:
Would this apply to FS9 as well ? if so could you please explain your method of solving this a little more as very new to Gmax.I have some pictures show a very similar thing happening to a model I'm working on,left,front and right view.
Click to expand...

Yes, it could work for FS2004 as well.
 
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