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Vue F.A.Q (Last Updated: 2024 Dec 30 8:14 pm)



Subject: Radiosity Problem - Update, possible fix


JDWohlever ( ) posted Wed, 05 February 2003 at 2:18 PM ยท edited Mon, 30 December 2024 at 2:11 AM

file_44638.jpg

Ok, I tried every type of light and what finally worked to a degree was using spotlights with the following settings: Color: RGB 255 pure white Softness: 45 Spread: 90 Falloff: 99 Power: Depends on scene I used 25 for render attached I placed a 100 pure transparent box on the object(the 4 wheeler)and named it DUMMY Next I made a half dome of 60 spotlights with the above settings. Now the tricky part. I selected all the spotlights and selected to TRACK the DUMMY object. At this point I got a warning that some lights whereblah blah blah.. I clicked ok. This is important becuase if all lights point at your object it wont work. ??? Anyway, In the preview window I still had the freaking pink problem but when I did a FINAL render the image came out looking like attached pic. So curious I did an Ultra render. The pink was back. So as long as you do no higher than a Final render it will do exactly as it should. Once you do higher a bug kicks in and starts throwing a pink hue around. Personally I think there is a bug in the light coloring and pure white is not considered pure white by the raytracer. But for now this will work until a better solutioncomes along.


JDWohlever ( ) posted Wed, 05 February 2003 at 2:24 PM

file_44639.jpg

Interesting update #2 I went into user render settings and clicked everything except for optimize last render pass and set radiosity for 16 rays and about 75% quality. Attached is the results. Somewhere between Final and User settings is a render bug. I did not let it render completely!! It would have taken 6 hours for a 300x200 render so I justattched the beginning so you could see that it was indeed WHITE. :)


MightyPete ( ) posted Wed, 05 February 2003 at 2:47 PM

file_44640.jpg

Did you check those setting the ones on the last tab in the effect spot of the atmosphere editor? If you look at the part carefully it is going to bleed to pink all the lights in your scene if you turn don't it off. That red color there is Vue's default. If for sunsets. Just cause you deleted the sun may not make no difference. Make sure you picked a white atmosphere before you deleted the sun. Like the white mask one that there.


JDWohlever ( ) posted Wed, 05 February 2003 at 4:02 PM

file_44641.jpg

MightyPete, I appreciate the effort, but I did try as you said. Still the same problem. I checked and double checked the settings and the included pic is the result. There is a bug (or feature?) somewhere in the light rendering that tells Vue that if X amount of lights = certain number then introduce coloring. If X=Y then COLOR = X+C*Y Where X is lights Y is Number of lights and C is color spectrum So If Lights =21 then Light Color = Lights + Red * 21 That's the easiest way I can explain what I think the problem aka feature may be.


JDWohlever ( ) posted Wed, 05 February 2003 at 4:17 PM

Ok, I think I have finally figured this out. The way soft shadows works in Vue 4 is that the far fading edges of the light darken through the color spectrum. Picture a bowl. The very middle inside of the bowl is pure white. As you go further out toward the edge the white slowly goes through the color spectrum to pure black. The closest colors to pure black in the light spectrum is red, infra red so that last visable colors you see near balcness is red. When u add more lights the red, which isnt visable with justa few lights,as it is so lite, is defined with more lights, hence you get the noticable pink with radial lights. Becuase radial lights radiant in all directions for the center, thereis a cirular red area around each light beforeit fades out. With the ability to edit the fall-off of radial lights there is nothing that can be done. This is why with spotlights the pink is easier to manage becuase you can control the fall off of the spot lights so the "red" area is only at the very edges of the spotlight. SO the only way to "fix" this would to be able to 100 completely control the fall-off decay of lights which I can;t see doing.The only other option I think of is to try very dark colored direction lights as they shouldn't have any fall-off.


JDWohlever ( ) posted Wed, 05 February 2003 at 4:28 PM

file_44642.jpg

This render confirms my thoughts. If you look at the objects and shadows you can visually see where the light goes from white to black, but along the way goes through the red color spectrum. Can anyone who has ties to e-On Software point them to these threads and see what their response is? I would like to know if this can be addressed. Sorry to keep babbling but this just got under my skin ;)


MightyPete ( ) posted Wed, 05 February 2003 at 5:14 PM

I wonder if it's the material that you using tranfering color to the scene. It seems to me that you got weird colors happening there. You can always go to E-on and point them to this tread in the bugs spot on E-On's site. Thing I would do first. set everything to white. Like I mean everything in the atmophere editor. Change the material. maybe use a mapped white picture texture, try it. It could be coming still from the complex procedural materials.


JDWohlever ( ) posted Wed, 05 February 2003 at 5:56 PM

Thanks for the suggestion Pete. You've been a lot of help trying and I appreciate it. I went in PSP 7 and made a 16x16 pure white bitmap. Applied it to everything. Same deal. It was a nice idea though.


nggalai ( ) posted Mon, 10 February 2003 at 7:23 PM

Hi JDWohlever, I stumbled over this, and a related issue, some time ago. My conclusion (mainly based on educated guesswork ;) ) was that Vue hits an internal render precision limit and hence introduces rounding errors -> colour hue shift -> pink/red. Only thing that could remedy it would be a higher precision render engine. But that's, as I mentioned, only guessing. I asked e-on about their internal precision settings before when running into a problem with very soft and very faint spotlights, but haven't received a reply, yet. We'll have to wait and see. ta, -Sascha.rb


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