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AppGameKit Classic Chat / [3D] Z-Order changes for some objects

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BatVink
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Posted: 31st Dec 2015 13:11
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In the video below you will see that the hoop z-order jumps forwards as the camera moves towards it. I don't know if I have done something wrong, or it is a bug.

1. Hoops are standard planes with a transparent PNG texture.
2. Hoop plains dissect the track. i.e they are supposed to look like the track travels through them.
3. Track is a mesh made from a memblock. The hoops represent the start/end of each track section (object)
4. If I break each track section up into 100 smaller sections, the result is the same.
5. The track objects datum point is the start of each section (where the hoops are)
6. Sometimes the track in from of the hoop drops behind, but tracks further back are seen in front of the hoop!
7. I have tried both Cull modes of the track, with the same result.
8. I have tried untextured plains for the hoops, with the same result.

Any ideas???

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Preben
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Posted: 31st Dec 2015 14:42
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Happy new year to everyone

This is the same problem:
https://forum.thegamecreators.com/thread/214368

You can try to play with the SetObjectDepthWrite and see if it helps , otherwise you need to convert your hoops to 3d objects.

As i remember i changed the SetObjectDepthWrite depending of the distance from the camera to the object . and tried to avoid transparent object getting behind or infront of other transparent object. so you could also try to make the track to non transparent and see it that solve it.




best regards Preben Eriksen,
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BatVink
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Posted: 31st Dec 2015 16:37
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Thanks for your suggestions.

Quote: "You can try to play with the SetObjectDepthWrite and see if it helps"


I just tried this on the hoops, track and then both. I got different variations on the same problem.

Quote: " otherwise you need to convert your hoops to 3d objects."


I tried this earlier, but it didn't work. But does this mean that Plains aren't like normal 3D obects?

Quote: " you could also try to make the track to non transparent and see it that solve it"

I have tried this now, and this also didn't fix the problem.

Changing the SetObjectDepthWrite based on camera distance would be too difficult to implement in my scenario.
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Blendman
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Posted: 31st Dec 2015 18:56
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You can try to change the pivot of your object, Paul has told me it can work for alpha issues, in some case.
(FixObjectPivot())
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BatVink
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Posted: 1st Jan 2016 12:32
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I tried your suggestion, but I seem to have found a bug in FixObjectPivot()
When you use this command, it sets the 0,0,0,point of the object to 0,0,0 in 3D space!
Because I am using the position of the object to locate the hoops, they all shift back to 0,0,0.
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Paul Johnston
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Posted: 5th Jan 2016 14:56
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Intersecting transparent objects are a pain to get right as they don't write to the Z buffer. Could you send me the project so I can see if there is a way to make this better?
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CJB
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Posted: 11th Jan 2016 14:12
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@BatVink: Did you ever get this problem resolved? Also, what video editor did you use? I have fraps for capture, but would be nice to add some simple text. Thanks!
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BatVink
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Posted: 29th Jan 2016 11:32
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I missed the updates to this thread

I've sent Paul the project to look at this morning.
I tried various things (FixObjectPivot, one object with multiple meshes) but no luck so far.)

Video: I use Open Broadcast to record because it can capture OpenGL canvases and standard windows in the same video. then I use Serif MoviePlus to add text. There is a free version that will do everything you need for simple videos like this.
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CJB
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Posted: 29th Jan 2016 17:18
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Great! Thanks. Free is good
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