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DarkBASIC Professional Discussion / using plane as decal problem with transparency

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Chiblue
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Location: NE PA, USA
Posted: 31st Aug 2010 23:17
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I am using a textured plane to represent a bullet open, I am creating the plane and texturing it, then instancing it when I need it...these are the attributes I am using..

Ghost Object On bullethole
Set Object Transparency bullethole,1
Set Object Ambient bullethole,true
Set Object Light bullethole,0
Set Object FOV bullethole,45

The hole appears perfectly, with one exception.. when I hit a wall and position the plane instance part of the center of the image
i.e.the bullet hole itself I can see straight through to the scene behind the wall/plane...

But the main part of the alpha blending i.e. the area around the hold I only see the wall as I would expect...

Any ideas on why this would be happening?
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Green Gandalf
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Playing: Malevolence:Sword of Ahkranox, Skyrim, Civ6.
Posted: 31st Aug 2010 23:48
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What's the problem exactly? Wouldn't you expect to see through the hole? Perhaps you need to clarify what you mean - and give us a screenshot of how it looks.
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Chiblue
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Posted: 1st Sep 2010 03:17
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Sorry, see attached image... you will notice that the bullet holes you can see the terrain behind i.e. blue sky, grass, road etc...

this is a screen show...
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Chiblue
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Posted: 1st Sep 2010 03:18
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sorry could not get the uploader to work...

Here is the bullethole image I am using...
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Rich Dersheimer
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Posted: 1st Sep 2010 04:13
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If you are shooting holes in a wall, then it makes sense to see through.

But... if you are shooting holes in a cube, then all you would see through the bullet holes is the inside of the cube. Check if your cube has normals on both the inside and inside. I think it's the SET OBJECT CULL command that will give your objects interior surfaces.

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Chiblue
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Posted: 1st Sep 2010 04:24
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but I don't want a hole, but the image on the surface... so it looks like a the bullet has hit and damaged but not penetrated...
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Visigoth
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Posted: 1st Sep 2010 04:40
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too much black in your bullet hole image maybe? Or, when you set object transparency, try the different modes. 6 works best for me.
The transparent colour is determined by the SET IMAGE COLORKEY command or the alpha channel of the texture. The transparency modes are used to control when and how the object is drawn into the scene, and are described below. Special consideration should be used with the depth sort system, which takes the coordinate of the object and camera and depth sorts based on the distance between these points. You can inadvertantly create a situation where a large object behind a small object would have a shorter distance, and be rendered last instead of first.

0 - draw first no alpha
1 - draw first with alpha masking
2 and 3 - draw second which overlaps solid geometry
4 - draw second alpha test (only render beyond 0x000000CF alpha values)
5 - water line object (seperates depth sort automatically)
6 - combination of 3 and 4 (second phase render with alpha blend AND alpha test, used for fading LOD leaves)
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Chiblue
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Posted: 1st Sep 2010 04:49 Edited at: 1st Sep 2010 04:51
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thanks, I tried all transparency settings but still see through it...

But if I use transparency 4 without ghost object... seems to work..
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Visigoth
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Posted: 1st Sep 2010 04:58
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Instanced or Cloned plains?
You may have to use Clone Object, then apply all the transparency and ghosting.

Unlike CLONE OBJECT, this instance will share most of the original objects data and be dependent on the original object remaining in existence to hold such data. Instanced objects do have the ability to hide/show both their limbs and hide/show the object, independent of the original object. This command is ideally suited to copying large numbers of primarily static objects such as trees and rocks where the original model data is to remaing largely unchanged.
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Visigoth
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Posted: 1st Sep 2010 05:03
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you know, I just had a thought. Could it be possible to make a "stack" of decals as one object, each decal a limb, and then just hide them? As you need one, just position the limb and show it?
One object way better than many, I've found.
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KISTech
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Posted: 1st Sep 2010 19:43
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Take your bullet hole image back into your paint program and the parts that you want transparent make them transparent in the alpha channel.

OR

Change the color of the middle of your bullet hole to something other than rgb(0,0,0), like maybe rgb(16,16,16) and it will show.

In almost everything I've done with transparency, SET OBJECT TRANSPARENCY, 3 or 5 always worked the best. However, each situation is different so you'll have to experiment with that.

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Softwizz
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Posted: 4th Sep 2010 18:05
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I agree with KISTech, make the actual bullet hole grey or something instead of black.

The way it works now is great for shooting at thin objects like wooden doors or sheets of thin metal (corrugated iron sheets) but if you are shooting a stone block then use a slightly different coloured decal.

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