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sky rendering - Printable Version

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+--- Thread: sky rendering (/showthread.php?tid=530)

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- alex25 - 03-08-2007

alex25 Wrote:should be also set the far clipping plane to the size of the horizon?

nevermind, there are cases when the horizon is below the track (but i guess the sky will always be above) so we might not want to do that.

--alex--

- joevenzon - 03-08-2007

also, just for future reference, the z-buffer gets cleared after drawing skybox stuff, so the horizon won't ever be drawn in front of normal objects.

- alex25 - 03-09-2007

joevenzon Wrote:also, just for future reference, the z-buffer gets cleared after drawing skybox stuff, so the horizon won't ever be drawn in front of normal objects.
and it should stay that way. i just experimented with disabling clearing the z-buffer after drawing the sky and it was very unnerving to suddenly have objects pop out of the horizon as you drive around (you can see this very well at barcelona). sorry for a bad idea.

--alex--

- Borjaserrano - 03-21-2007

Hey guys!!, i'm having the same problem since a few days ago!!, and it's really annoying!. I didn't touch any sky origin parameters. I'm having this issue in all tracks with a far horizon. Did you found any solution Alex?

[Image: 01.jpg]
[Image: 02.jpg]
[Image: 03.jpg]

- thelusiv - 03-21-2007

Uhm....those screen shots are not even from VDrift.

- Borjaserrano - 03-21-2007

Does this matter have any relevance?

- thelusiv - 03-21-2007

Well these are the VDrift forums after all. What game is it?

- Borjaserrano - 03-21-2007

OMG!, lol!, I was searching in Google for that issue, and I found this forum!.. really the alex's screenshots of the first page looks very close to rFactor!!, and I'm having this problem as well in rF, but I just've to solve it Smile

- thelusiv - 03-21-2007

Actually, the links & screenshots he posted were of an rFactor track which he imported into VDrift (sadly we can't distribute it because of copyright).

- charlieg - 03-22-2007

Um... look at the ugly black line in the sky. I'm running a relatively low spec system... but still surely that is not desirable.

You'll need to view the image full size to see it:
http://vdrift.net/Gallery/media.php?f=0&sort=0&s=20070322094245241

- joevenzon - 03-22-2007

Charlie, what graphics card do you have?

That problem is a common one when using low-res textures... the top edge of the texture gets color bleed from the bottom edge. I think there's a way to tell opengl not to do that, but I haven't had much luck with it.

- thelusiv - 03-22-2007

I've seen some seams in the skyboxes on several tracks, on both of my video cards...I have a really good one and an OK one (BFG Tech 7600GT OCE PCIx16, and BFG Tech Ti4200 AGP8x).

edit: actually looking at charlie's screenshot now I see his are horizontal seams, I only see vertical ones.

- charlieg - 03-26-2007

It's an onboard 3D card on my laptop. An Intel i855 chipset I think, something like that. (Not got it here, can't check.)

- alex25 - 08-14-2007

joevenzon Wrote:Based on the above, I made it so objects marked skybox track the camera's y (vertical) offset, checked in SVN R1554. Let me know if this fixes the problem for your horizon, or makes the horizon go even further into the sky (in which case I need to flip the sign). Also, note that this change applies to all skybox objects, so it may mess up the sky on some tracks. If anyone notices that this happens, I can make a separate "horizon" parameter so the old method is used for the sky.

looks like we lost this fix when we switched to the scenegraph branch:

[Image: shot051.jpg]

can we get it back? please...

--alex--

- joevenzon - 08-14-2007

Try R1807....