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Old September 10th, 2007, 02:17 AM
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Default Re: FQM Beta 12 Testing Help

Raapys said:
- The planets glow too much. With some planets/atmospheres it's more obvious than others, but overall a bit too 'glowy', I'd say. It's really the overly-bright 'innermost' part of the glow that annoys me, the 'thin' outer part isn't bad( see attachment ).


First, note that the glow size is directly proportional to the planet model size. The glow size is pretty much as small as I could make it and still be able to see it at normal viewing distances. Its often indistinguishable at the "back" of the system.

I'm not really sure if this will address the crux of this particular issue, but it is fairly related to it.. The thing about the glows is in how SE5 renders bitmap effects. When you look at the object head-on, the bitmap effect is drawn in the plane orthogonal to the line directly connecting the center of the object to the center of the system. The rim is perfectly symmetrical on all sides, as it should be. Rather than keeping the bitmap drawn parallel to the "surface of the screen," it is rotated along with the corresponding object to keep perspective. As the object rotates farther to the right, the plane of the effect starts to become occluded by the sphere of the planet. The right side of the glow ends up behind the planet, and you see less and less of it. You can see this very clearly in the star demo screenshot, in the blue star. There is no visible solar flare at all on the right side of the star.

This same effect occurs in the stock game, but it is very difficult to discern. The only objects with both a model and a bitmap effect are warp points and stars. The corona glow effect for the stars is really large (relative to the star model size), and tends to be dim. In a binary system, you can't really see the occlusion effect very clearly, since the part of the effect that gets covered up is just a tiny fraction of the continuously-fading glow.

When you compare the stock star glow effect to the FQM planet glow effect, they are very different. The planet glows are dual-band, with a brighter inner ring and a dimmer outer ring. The perspective warping tends to stand out. The same happens with the "active corona" part of the star glows. There isn't really much I can do about this, other than making the bitmap effects dully continuous, excessively large (like stock), or removing them altogether.

At least for me, I can't really discern any issue with the planet glow effect at normal game viewing angles and distances. Certainly when you zoom in you can see the effects, but normally is it such a problem? The bands are really thin at normal viewing distances.

- 'Ringed' Planets: The ring looks to be cutting off the glow where it goes behind the planet. Looks like an engine problem, though, so I guess there's not much to do about it.

I can either make the bitmap effect always behind the model, or some sort of dirty blending effect that typically results in lots of texture clipping. In either case, I can't really make it render "between" parts of the model. At normal viewing angles, I can't really see the cut off part of the glow very well (I never noticed it before this post, in fact!). Short of axing the glows, I am not seeing any way to fix this cutoff.
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