Stars


(Night4554) #1

Occasionally when I use the stars feature in the world section, the stars will redraw (randomly) every time I render a new frame. The end result is constant flickering of stars that looks, obviously, horrible.

How do i make it right?

StarDist (distance between stars): 12.02
MinDist (minimum distance from Camera stars start): 150
StarSize: .550

Camera ClipEnd 500

and I STILL get extreme flickering! http://rain.prohosting.com/night45/ is the page you can see it at…


(S68) #2

Mmm, yes, it is horrible, but I never
had these problems…

Is your console complaining? Sometimes i found in my console a message about ‘too many stars’ maybe that’s your case too… try use less stars!

Stefano


(Goo) #3

I get the same problem when I’m making an animation. What I normaly do is make a large UV sphere and map a picture onto it that has a whole lot of stars. You need to make your ClipEnd setting high enough so that you can always see the sphere. One advantage is that it cuts down on render time needed for the image if you’ve got a whole lot of stars in your picture.

Goo


(LohnS) #4

well night, i didn’t know you were a member of this board. fancy that

meet another of the crew in the Fellowship of Blenderwars movie


(SKPjason) #5

The problem is that your camera is probably moving… the star buttons in world settings allow you to set a minimum distance from the camera to beginning of stars… you cannot set a maximum distance tho… Now figure into the mix that the Blender Camera has a start and end distance which it uses to “see”… anything past the end distance will not be seen…

So… if the camera moves… the end distance changes… stars which were further away and were not in the “seeable” distance now find themselves close enough to be seen… hence the winking and blinking stars…

I find this to be a major disadvantage for anims (tho stars make for great stills). So I usually just apply a star map to the world… or just add it to a sphere mesh enclosing my scene…

:smiley: Jason


(RipSting) #6

One possible cause of this is the Aliasing of the image. The stars may be less than 1 pixel wide - thus the flickering effect when the camera moves. Try turning on OSA with a level of 8 or so.


(BgDM) #7

One possible cause of this is the Aliasing of the image. The stars may be less than 1 pixel wide - thus the flickering effect when the camera moves. Try turning on OSA with a level of 8 or so.

No, I have to agree with SKPjason on this. If you make the camera move, then the stars move and flicker. I had this happen to me once during an animation. If you make your objects move, then all will be well.

Although, according to theeth, if you make the star distance a huge number, this will not happen.

BgDM


(theeth) #8

I said that? Uhm. Actually, it will only get better if you put clip End of the camera high enough, and if you make sure not to move the camera too much, even if that means scaling all the scene down.

Martin


(Millhouse) #9

Have you tried using the colonise button i’ve done some space animations and i have never had that problem but i set the star distance far apart and star distance to 15 the rest i have as defaults usually i dont really see why its doing that unless your stars are really really small one way round it may be to use a backbuf image if the camera is not going to be moving around.