Formula 1 (95) z-fighting issues

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IceMan
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Formula 1 (95) z-fighting issues

Postby IceMan » Sat Mar 31, 2018 3:18 pm

I'm seeing flickering polygons quite a bit in the original Pysgnosis Formula 1 game. Particularly at Monaco with "ninja" draw depth selected. It's a shame as dgVoodoo2 renders it with a depth issue which makes the rear wing appear inside the car, so nGlide looks just about better, except for the polygon chaos
My PC spec: Win10 64bit, i7-4970K (not overclocked) MSI Nvidia GeForce GTX 980, Creative Soundblaster ZX, 16GB RAM, Asus Z98-A motherboard, ROG Swift GSYNC monitor

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Zeus
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Re: Formula 1 (95) z-fighting issues

Postby Zeus » Sat Mar 31, 2018 3:52 pm

Does it occur only with one particular camera setting (PgUp/PgDown)?

IceMan
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Re: Formula 1 (95) z-fighting issues

Postby IceMan » Sat Mar 31, 2018 4:29 pm

Particularly the closest view to the car
My PC spec: Win10 64bit, i7-4970K (not overclocked) MSI Nvidia GeForce GTX 980, Creative Soundblaster ZX, 16GB RAM, Asus Z98-A motherboard, ROG Swift GSYNC monitor

IceMan
Posts: 107
Joined: Thu Nov 19, 2009 10:32 pm

Re: Formula 1 (95) z-fighting issues

Postby IceMan » Sat Mar 31, 2018 9:35 pm

To come back on this: I'm not sure if you're meant to have clipping on the rear wing or not (i.e. nGlide is better than real Voodoo), as on PCem, with a fully software emulated Voodoo2, the same rear-wing z-issue occurs, as it does in dgVoodoo.

But the other polygon bugs at Monaco (car sinking, etc) are clearly an issue.
My PC spec: Win10 64bit, i7-4970K (not overclocked) MSI Nvidia GeForce GTX 980, Creative Soundblaster ZX, 16GB RAM, Asus Z98-A motherboard, ROG Swift GSYNC monitor

IceMan
Posts: 107
Joined: Thu Nov 19, 2009 10:32 pm

Re: Formula 1 (95) z-fighting issues

Postby IceMan » Sun Apr 01, 2018 11:32 pm

One final thing: overall dgVoodoo2 gives the best result, apart from the rear wing being inside the car. The main issue with nGlide I'm noticing on many tracks is that the edging of transparent textures (trees for example) fade to a hard black colour. Not sure if this can be improved, as I don't see it in PCem or dgVoodoo2 really.
My PC spec: Win10 64bit, i7-4970K (not overclocked) MSI Nvidia GeForce GTX 980, Creative Soundblaster ZX, 16GB RAM, Asus Z98-A motherboard, ROG Swift GSYNC monitor

IceMan
Posts: 107
Joined: Thu Nov 19, 2009 10:32 pm

Re: Formula 1 (95) z-fighting issues

Postby IceMan » Mon Apr 02, 2018 12:12 pm

Time for some screenshots and video evidence! Note that I'm running one of the various Formula 1 patches though, I think it's the "joystick version" (see here http://www.patches-scrolls.de/patch/1711/7/), it skips the opening video which crashes otherwise. It has some bugs in the executable, but I don't think the 3D is part of it.

You can install it by installing the game on a virtual machine then copying over the install folder to Win10.

PCem is running the original CD version (from Platinum re-release):

First up, here's a comparison of the dark edging to the transparent textures (trees and horizon):

PCem - part of rear wing clipped away, trees and horizon have clean cut edges:
Image

dgVoodoo2 - whole rear wing clipped away; trees and horizon have clean cut edges:
Image

nGlide - entire rear wing visible; trees and horizon have dark, fade-to-black edges, making them feel darker (especially true on overlap of closest trees on the right to the ones that follow):
Image

PCem and dgVoodoo tree/horizon edging seem closer to real Voodoo2 hardware (see here: https://www.vogons.org/viewtopic.php?f= ... 15#p661792).

Now for the video, showing the main z-fighting issue, around Monaco, when using the close-up behind-car view. This is with Nvidia default driver settings and default nGlide settings:

https://youtu.be/-KTRS0nnpDw
My PC spec: Win10 64bit, i7-4970K (not overclocked) MSI Nvidia GeForce GTX 980, Creative Soundblaster ZX, 16GB RAM, Asus Z98-A motherboard, ROG Swift GSYNC monitor

IceMan
Posts: 107
Joined: Thu Nov 19, 2009 10:32 pm

Re: Formula 1 (95) z-fighting issues

Postby IceMan » Mon Apr 02, 2018 4:42 pm

PCem is definitely the most accurate; compare the above screen shots to actual Voodoo2 card below, thanks to tgod on VOGONS (https://www.vogons.org/viewtopic.php?f= ... 31#p662116):

Image

I think the red Marlboro chevrons might have been intentionally removed from the budget Platinum rerelease.
My PC spec: Win10 64bit, i7-4970K (not overclocked) MSI Nvidia GeForce GTX 980, Creative Soundblaster ZX, 16GB RAM, Asus Z98-A motherboard, ROG Swift GSYNC monitor

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Zeus
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Re: Formula 1 (95) z-fighting issues

Postby Zeus » Tue Apr 03, 2018 2:11 am

Thanks for all the info. That should be enough to reproduce them on my end.

IceMan
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Re: Formula 1 (95) z-fighting issues

Postby IceMan » Wed Apr 18, 2018 9:34 pm

Just found F1 97 has the same issue, when driving in-car cockpit view, you can see through the floor!
My PC spec: Win10 64bit, i7-4970K (not overclocked) MSI Nvidia GeForce GTX 980, Creative Soundblaster ZX, 16GB RAM, Asus Z98-A motherboard, ROG Swift GSYNC monitor


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