|
|
HDRI Questions
About Truespace Archives
These pages are a copy of the official truespace forums prior to their removal somewhere around 2011.
They are retained here for archive purposes only.
HDRI Questions // Archive: Tech Forum
Post by Wigand // Mar 18, 2006, 5:48am
|
Wigand
Total Posts: 462
|
Hallo
I need some advise for HDRI-Rendering
What is the best relation between size and quality of the HDR picture if I do
not want to see pixels in my renderings?
How I can find the best size and distance of my objects in a scene in relation
to the HDR picture?
Is it possible to rotate the background?
Martin |
Post by daybe // Mar 18, 2006, 6:10am
|
daybe
Total Posts: 562
|
It isn't possible to rotate the background image, to get around this you could rotate you whole scene, camera and all.
There seems to be a flaw in the Lightworks renderer that causes some pixelization so you could in theory turn off display image in the hdri panel and use the same image (if you have a bitmap, hdrshop can convert it but you will have to edit the file after to use it as a background image it seems) in the background panel in the render options instead. |
Post by noko // Mar 18, 2006, 8:40am
|
noko
Total Posts: 684
|
Hallo
I need some advise for HDRI-Rendering
What is the best relation between size and quality of the HDR picture if I do
not want to see pixels in my renderings?
How I can find the best size and distance of my objects in a scene in relation
to the HDR picture?
Is it possible to rotate the background?
Martin
At this time Vertical Cross HDRI's renders the background without pixellation on any angle of view unless you really magnify what you are looking at. Other formats actually render areas of HDRI background just fine but have an area or same angle where the camera and even reflections if reflecting that area will be pixellated.
To get a sharper background image you can change the FOV to a higher number on the camera, this will use more of the HDRI for your background or increase resolution being used. The down side is you start getting a fish eye view (unless that is what is desired) of your scene objects if excessive. Remember even if the HDRI is high resolution it only has a small area dedicated for each viewing angle or side. In other words a 3200x1600 panoramic image may only have 512x512 pixels dedicated to the floor, so zooming in on the floor in your scene at 1600x1200 will probably cause pixelation. Larger HDRI's will be better in this case.
To get objects on scale with background depends on camera FOV and how close or far from your scene objects you are. I like to go close and work my way back from scene objects to get perspective of objects matching background. I hope this helps. |
Post by Wigand // Mar 18, 2006, 10:10am
|
Wigand
Total Posts: 462
|
Thank you daybe and noko
your answers help me a lot. I am still experimenting with HDR.
Now I tested a picture generated with terragen and the SO HDR Output.
I made six images then put them together (with cube2cross) as a VCross
and made a shere with HDRShop too.
With the VCross it looks well, but one angle of view I have a blackness with
some color on the left side.
Do you know this effect?
And with the sphere I got a black picture with only a small angle where I
could see my background.
Do you think these are terragen, or TS7 problems ?
(In the preview (fileloading) I can see the size of the HDR, it's 2880*3840, 24bpp 43200KB.)
Martin |
Post by Vizu // Mar 18, 2006, 5:20pm
|
Vizu
Total Posts: 628
|
You can set the HDRI settings how you like for the environmet Light than create a box and flip all faces and paint it with youre HDRI map and enlarge it to fit to youre screen.
In Opjectinfo panel - render options, disable the cast and recieve shadows and you have what you want ( think so ) :)
ah and excuse my poor english ... alles auf Deutsch wäre natürlich einfacher. |
Post by trueBlue // Mar 18, 2006, 5:45pm
|
trueBlue
Total Posts: 1761
|
Vizu, haben Sie tryed überhaupt Babel Fisch-Übersetzung? http://world.altavista.com/ keine Handlung, dachte ich gerade, daß es für Sie nützlich sein konnte. :) |
Post by Wigand // Mar 19, 2006, 2:02am
|
Wigand
Total Posts: 462
|
For english readers look below.
Hallo Vizu
Ich verstehe schon was Du gemeint hast, aber ich würde das ganze gerne
mit den vorgegebenen Funktionen von TS7 probieren. Und wenn das dann
nicht richtig klappt, muss wohl irgendein Fehler vorliegen. Das war jetzt mein
erster Versuch mit HDRI aus Terragen und ich frage mich jetzt halt,
ob ich etwas falsch gemacht hatte. Die Einstellmöglichkeiten für HDRs sind in
Truespace schon interessant, aber ich möchte auch wissen wo die Grenzen
liegen. Ich bringe es z.B. leicht fertig TS7 zum Absturz zu bringen, wenn
ein spezielles HDR Bild geladen wird. Ebenfalls scheint es ein Bug zu sein, dass
der Pfad zum HDR-Bild nicht mit der Szene abgespeichert wird. Mein Englisch ist auch nicht besonders gut wie Du gleich sehen kannst.
Gruß
Martin
Hi
I think I know what you mean, but I want to use the standard function of
TS7. And if it do not work right, there must be a bug. This was my first try
to use terragen to create a HDRI and now my question is, did I something
wrong. The possibilities for individual adjustments for HDRI in TS7 are
interesting, but I want to know where the limits are. It's easy to let TS7
crash if I load a spezial HDRI. And it is a bug too, that the path of the
background is not stored with the scene.
Martin |
Post by Vizu // Mar 19, 2006, 6:27am
|
Vizu
Total Posts: 628
|
I wish i could help you but my Truespace have so many bugs on the time that it is impossible to work in it.
Hast du mal auf www.3d-ts-forum.de nachgefragt ? das ist die Deutschsprachige community. |
Post by noko // Mar 19, 2006, 11:57am
|
noko
Total Posts: 684
|
Wigand,
Make sure the black portion of the vertical cross is 0.0.0 for color. Have you tried manually setting the Environment type to "Cross v." in the Global environment map panel? The dimensions sounds right, have you tried a smaller version of the same map? |
Post by GraySho // Mar 19, 2006, 8:42pm
|
GraySho
Total Posts: 695
|
I'll try it later this day, since I have terragen and hdrishop myself. |
Post by Vizu // Mar 19, 2006, 9:50pm
|
Vizu
Total Posts: 628
|
Ich habe es aucch nicht Pixelfrei hinbekommen ;(
Irgendwie sind meine HDRI Auflösungen nicht hochgenug also belasse ich es dabei das ich im Hintergrund eine 2D Plane aufziehe die ich aud Schatten berechnung herausnehme und mit meiner BG Texture bemale.
In English ...
No way to fix the problem ;) |
Post by Johny // Mar 20, 2006, 6:50am
|
Johny
Total Posts: 672
|
Rendered with HDRI. 2xAA
Can you see the white noise pixel? |
Post by Wigand // Mar 20, 2006, 11:03am
|
Wigand
Total Posts: 462
|
Hi Johny
What happens, if you try a smaller value of Sample. TS7 would use less
lights. Or try saturation, you could chose smaller values than 0.
Do you still have white pixels?
Your pixels are on the object, my pixels and faults are on the background.
I think we have to start a list with these effect to help the programmers. ;)
Martin |
Post by Vizu // Mar 20, 2006, 11:31am
|
Vizu
Total Posts: 628
|
Johnny have you try it with a higher sample resolution ? |
Post by Johny // Mar 20, 2006, 5:33pm
|
Johny
Total Posts: 672
|
Smaller sample resolution, higher sample resolution (tested until 500 sample) and changed saturation value not solved this white noise problem.
But when I add "Ray Limit" value on "RayTrace Option", the white noise disapear. (problem solved):banana: |
Post by TomG // Mar 22, 2006, 6:02am
|
TomG
Total Posts: 3397
|
Ray Limit does make the raytracing stop after a certain number of "reflections of reflections of reflections of reflections...." - if the limit prevents that process from ending up at a particular color value from the scene, then what happens is the area renders white (since it didn't reflect enough times to determine what the final color ought to be).
This is not an HDRI related issue, but rather just an issue in raytraced reflections overall :) Also not a bug, again just the nature of calculating traced rays, that they need to come to a stop somewhere for a color to be determined and without that, the color defaults to white.
HTH!
Tom |
|
