what controls the default background

[veej]

Hi,
with the default visopt settings I get the default sky (denim blue). Plesae can someone tell me how to change the sky? Can i insert an image of a sky (jpeg or hdri) somehow and get that to render in?
Ps I looked at the tutorial already and did not have any luck
thx
veej

[pnavarra]

what controls the default background

Hi,
You can change this parameter in Environnment settings.
Both GI and Background are mapped with a sky.
I suggest you to leave the sky in Gi and change the background as a bitmap and check Envrionnment for texture settings.

Cheers.

[joe_b]

what controls the default background

If you want to insert an hdri environment just go to the environment panel of our options rollout. Then click on GI/BG map ( the m/M next to GI/BG). Then change that texture from the Sky Texture to a Bitmap texture ( there is a combobox on the left side of the Texture Editor that controls the texture type ). Then choose your texture map by clicking on the m toward the bottom right of the texture editor. Also be sure to change the UVW mode from "Texture" to "Environment". Let me know if you still run into any issues.

[veej]

what controls the default background

Joeb,
I have tried that many times over, with the same result the sky renders black. I used jpegs & hdris.
I inserted the HDRI in the Env\background\M and rendered the foll image
http://forum.sketchup.com/attachment...3&d=1166120793

If I insert the hdri in the Env\GI\M the whole scene renders pitch black as if some one has cut off the sun.
I have tried many renders with the above setting chaging the multipliers around etc with almost the same result.

I can easily insert the sky in photoshop using the alpha, but I am looking for a "TRUE" render and not photshop ! very frustrating!
thanks
veej

[joe_b]

what controls the default background

Insert the image into both the GI and BG slots. Also make sure you have global illumination enabled ( Indirect Illumination slot ).

The GI slot is used for lighting the scene whereas the BG slot is the reflection/refraction background. So you will not see the map unless it is in the BG slot, and you will not get the lighting effect unless it is in the GI slot.

[veej]

what controls the default background

Joeb,
I did everything you said step by step and still same thing!
could I email you the skp & the Hdri and you could tell me whats wrong?
thanks
veej

[dalomar_cg]

what controls the default background

You also have to specify what type of environment map it is: either spherical, mirror ball, cubic, or angular. If you don't know which one your map is then try each of those mappings to see if one of them works. If that still doesn't work you can email your scene and hdri to myself or Joe.

[joe_b]

what controls the default background

Oh - another thing that would probably cause that - try disabling the physical camera and see if that resolves your issue. The default physical camera settings are tuned for the Physical Sun/Sky - which provide much more light energy than the hdri probably does. If you still want to use the physical camera than you would need to adjust it accordingly. If that doesn't help either then feel free to send me the scene.

[veej]

what controls the default background

Oh - another thing that would probably cause that - try disabling the physical camera and see if that resolves your issue. The default physical camera settings are tuned for the Physical Sun/Sky - which provide much more light energy than the hdri probably does. If you still want to use the physical camera than you would need to adjust it accordingly. If that doesn't help either then feel free to send me the scene.

Joeb,
the camera setting fixed it.
thank u
will upload once i have a satisfactory rendering, looking much better
thanks
veej

[joe_b]

what controls the default background

No problem - sorry it took me so long to think of that

[TOM_cg]

Re: what controls the default background

All right..VeeJ

I'll try the camera's settings as well.
Until now I used the HDRI background's multiplier ( 10.000 instead of 1 ).

Cheers

[rv1974]

Re: what controls the default background

Yeah, TOM is right. I also had to pump up the volume upto 4000-7000 (HDRI skies from docsh).I just wonder, what is more healthy: to tweak a camera's settings, or to increase hdri multipliers
2Joe, Dalomar:
I have another problem: My i had idea to get the best from two worlds- easy,fast and nice looking phisycal sun-sky+phys. camera shadows and realisic hdri reflections in large glass planes.So I put HDRI in "white" slot of glass fresnel reflections and... I hardly see any effect (even BIG values can't help. BTW, Is this called "per material GI" ?

[epinox]

Re: what controls the default background

joe,

I placed a jpeg on the background and had a render with it, but i cannot specify the zoom for the background image... It zooms too much and shows only one area in detail...


BTW i would really like to learn more about the HDRI image; can you direct me to a site that i can learn more?

[joe_b]

Re: what controls the default background

One way to control the background is to make your scene's bounding box larger by adding some geometry further away to make it extend larger. Thats my quick hack way of doing it sometimes. I believe you should be able to also modify how it is placed by using the tiling controls in the texture editor for the background texture.

Here is a quick link that explains HDRI a little. I'm not sure if that is too basic. But all you really need is to get an HDRI and plug it in as the environment / background. If you are using the physical camera you will probably need to increase the multiplier, or adjust your f-stop so the exposure is correct.