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DarkBASIC Professional Discussion / Transparent object disappearing randomly

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TheComet
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Posted: 10th Jun 2012 16:11
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Hey everyone


Look at the green ring on selected units in this video:



I'm using a plain object textured with a PNG with an alpha channel. The plain is positioned at Unit(n).pos.x# , Unit(n).pos.y#+0.3 , Unit(n).pos.z# which is more than enough distance above the ground to prevent Z-fighting. For some reason though when I use set object transparency obj,2 the plain will randomly disappear. If I use set object transparency obj,0, it is always visible. Why?

TheComet


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Pincho Paxton
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Posted: 10th Jun 2012 16:20 Edited at: 10th Jun 2012 16:35
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Are you sure that you ground is completely flat? The way it fades out is like it moves under the ground. Maybe Z clipping, but looks more like a mesh error. And it happens exactly in-line with the down dip, which could have caused the mesh to bend at that point. If you take height from the 4 legs, it does not account for bending in the mesh between the legs. If you take out Unit(n), and replace it with the circle's own check, that should fix it.

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TheComet
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Posted: 10th Jun 2012 16:43
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Hi Pincho

It is 100% flat, and the unit is positioned at ground height, putting the plain 0.3 over the ground. The thing is, if I disable transparency, I don't get this weird glitch.

I even tried positioning the plain +2 over the ground (which is way over the unit's head up in the sky), and I still get the error!

TheComet


TimePlan : https://docs.google.com/spreadsheet/ccc?key=0AmuAKJolqASndEVYOWMxb3l2OWV0UkV1anRSczZScHc
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Pincho Paxton
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Posted: 10th Jun 2012 17:02 Edited at: 10th Jun 2012 17:05
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Are all of the normals facing the right way? Maybe the ring has flipped normals? Maybe some of the ground has flipped normals, and culling?

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Chris Tate
DBPro Master
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Posted: 10th Jun 2012 17:55 Edited at: 10th Jun 2012 17:56
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Hi

I have no idea why the ring would dissapear like that with transparency set on mode 2. Is it the same with mode 1?

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TheComet
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Posted: 10th Jun 2012 18:19
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I don't know how, but that fixed it. I've always used transparency 2 to enable the alpha channel in images. Well I'm glad that weird glitch is over, thanks for pointing that out!

TheComet


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