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Sparkle texture under FSX or P3D with Ground Poly Wizard

Lagaffe

Lagaffe

Resource contributor
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992
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france
Good day at all,

I encountred a big probleme on my runway texture using FS2004 SDK to produce my MDL and MCX to obtain a BGL with the Ground Poly Wizard.
a) The runway material used in Gmax is standard (not FSX or multi-material) and it doesn't "sparkle". The texture used is a BMP with no alpha hannel. The material has one texture diffuse and nothing else !
b) The polygone used is small: 20mx20m (no problem with earth curvature) and at 0.0 m of altitude

Since 15 days, when I use GPW and compile the runway MDL for FSX , in FSX or P3Dv3 the texture "sparkle".
I tried several solutions:
- using layer 8, 12, 16, 20, 24, 28 and also 30 => nothing !
- changing the visibility parameter (in the GPW interface) and using a small value like 500m or 1000m => nothing
- validate DX10 option or not => nothing
- compiling with GPW for FSX or P3D => nothing
- the texture was transformed in DDS DTX1, DXT3, DXT5 or BMP 32b for the final scenery but nothing to to ... it was always sparkle under the two simulators.
- I don't try to modify textures parameters under MCX

Yesterday, at the end of solution and ideas, I try to use GPW to compile for FS9 and EUREKA I find the correct apparence of the texture under FSX and P3D v3.
For this last test, the layer used was always 28 and distance parameter 500m.

Somebody has an explanation of this phenomenon ?
 
If by "sparkle" (éclat) you mean "flicker" (vaciller), this is a common phenomenon when two parallel textured surfaces are in very close proximity and at such small displacements, it does not matter which texture is closest to the observer. The simulator will first render one texture, then in the same space the simulator will render the other texture. It does this in quick succession as a function of distance from the observer, creating a flashing or "vibrating" image. The solution is to remove one of the textures, or increase the displacement between the two.
I would suppose that one of your various passes through the GPW arbitrarily created a ground poly that did not trigger "z-flashing" (z being an axis along which these planes are elevated or lowered). You can test this hypothesis by loading one of your sparkle polygons, then, by using a tool like Instant Scenery, incrementally increasing the elevation until just before the displacement becomes visibly noticeable. A distance of somewhere between 5 and 30 centimeters should be adequate to achieve the result I predict.
 
Check if you entered the right altitude in the GPW. Sparkle sounds like a terrain texture showing through.
 
For =rk=
Sparkle isn't the right word (I am French), This texture is composed of various pixel white and black and this pixel change if the point of vue is modify. The term flashing is better ...

For =rk= & Arno
I work with a file.mgp in order to use always the same parameters (layer 28 and visibility 500m).
With the same MDL:
- if I compile for FSX with file.mgp the Ground Poly flash,
- if I compile for FS9 with the same file.mgp (name of the MDL, layer fixed, visibility also ...) it is right !

so I don't think that it is two parallel textured surfaces are in very close proximity because in this case FS9 compilation will not be OK.
 
The FSX output is corrected for the curve of the earth. So it can behave different when polygons are on top of each other. For example a big polygon might bend slightly different from a small one.
 
Yes, I'd try changing your elevation a bit, just to see if that clears it up.
 
Hi,

Tomorrow, I wil try in that direction changing a bit the elevation.
On the ground photo I have a flatten yet: this one is created with SbuilderX and Terrain Scultor to add some polys around the flatten and obtain a slope à 78.028m.

Perhaps whitout the ground photo or changeing the slope for a "normal" flatten I will find a solution ;-)
 
Hi,

I was sure that my flatten was at 78.028 but I have forgettent that it was made with Terrain Scultor.
A fast view under TS show me that the information was trunced on the seond decimal and it was not 78.028 but 78.03.

So I modify the height of the airport under ADE to 78.03 and each ground poly was positionned at 78.035 with GPW and ...

Theses ground poly are displayed correctly ! without flashs (LFAF - Laon-Chambry near Reims at France).

2016-04-16_192146.jpg


Thank to =rk= and Arno: they were right !
 
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