MR exterior

[sandiarch]

Hi friends...

I am practicing this MR exterior rendering.

I have rendered this with MR sun and sky with low final gather value and 2 bounces.

MR SUN-1.1

MR SKY-1.5

 

not sure why this image looks with a blue tint..pls tell me how can i get rid of this bluish shade.

also is there any setting where i can change the color of MR SUN?

 

please help..thanks in advance.

[nymn]

In the mrSun parameters rollout there under nonphysical tuning there is a place to adjust red/blue tint and the saturation of it... give that a try... -1.0 to 1.0 with 0 being neutral...

[pajalmeida]

I usually use this settings:

 

MR Sun:

Multiplier: 2

Red/Blue tint: 0,5

 

Mr Sky:

Multiplier: 4,5

Red/Blue tint: -0,35

 

Sometimes i change this settings a bit, but i think it gives a good environment color.

 

Hope i had given some little help.

[Justin Hunt]

Leave the multipliers at 1 to be accurate, to brighten the scene drop the EV value in exposure control.

 

The sun and sky colours are driven by the sun angle and changes as the angle changes. To alter the colour change the red/blue tint of either the sky and or the sun. Turn OFF "Inherit from sky" to do so.

 

You can also play with the white balance in exposure control.

 

jhv

[mattclinch]

Leave the multipliers at 1 to be accurate, to brighten the scene drop the EV value in exposure control.

 

The sun and sky colours are driven by the sun angle and changes as the angle changes. To alter the colour change the red/blue tint of either the sky and or the sun. Turn OFF "Inherit from sky" to do so.

 

You can also play with the white balance in exposure control.

 

jhv

 

+1

 

don't go changing multipliers of sun and sky.

[sandiarch]

here is the update

MR sun and sky is 1

 

now there is problem with color of sky..i need clear blue sky (fresh color)

how can i achieve that. i have played with red/blue values but didnt get good result.

[RevitGary]

"don't go changing multipliers of sun and sky."

 

I think it is good practice NOT to change the Suns multiplier.

But changing the sky multiplier is ok.

[odouble]

You can use the regular skylight in the daylight system with a sky image to illuminate your scene. That could me much easier. You can also just do it in post. None of the sky models give you a quality sky out of the box... Vray or mental ray

[Matt McDonald]

You might get more pop out of your sky by rendering out 32 bit EXRs and then tweaking the exposure and gamma using Photoshop's exposure tool.

[Justin Hunt]

Exposure control, depending on which you prefer turn Affect backround ON or OFF.

 

Play with the highlight, mid and shadow to really make it pop.

 

And if your still not happy, fix it in post.

 

jhv

[noi-pi]

Agreed, I do my background in post... you have great control. Save your file either on PNG or EXR.

[sandiarch]

Agreed to have background in post...BUT that is ok if we need final output as still images...

I wanna render the animation...in that case how can i do that in post.?

dont u think that it is better to have sky multiplier to higher side to get clear bright blue sky?

need more suggestions please....

[Dave Buckley]

ok, drag your physical sky from the environment into an empty slot in your material editor.

 

uncheck 'inherit from mrsky'

 

enable your viewport background to display the sky gradient

 

tweakt the red/blue values of the physical sky until it is the colour you want in the viewport.

 

depending on the version of max, you will also need to enable viewport lighting/shading/exposure etc to see the correct gradient in the background.

 

this way you get to keep the values of the sun and sky at 1, and you can still tweak the colours of the sky without affecting the actual sun and sky

[Justin Hunt]

By upping the multipliers of the sun sky causes more light to bounce around, blows out highlights, washes out mid tones and in general can lead to longer render times.

 

Use exposure control to brighten your images, thats what its for.

 

It is possible to control the backround in post when doing animations, render out the frames with an alpha channel and use After effects or even Photoshop CS3 to adjust. Same workflow as if your doing a still.

 

jhv

[sandiarch]

Thanks all of you for your inputs..they are really useful.

I could manage to adjust the sky color with red/blue tint (without disturbing the sun and sky multiplier)

I have attached updated image.

 

One more problem that i hv found with MR sun is...Ground/floor is receiving lot of light.brightness from MR sun...it doesnt look really good.. how can i get rid of this extra brightness for the ground/floor?

I know one option is to change the MR sun angle/time...but then that also changes the light/brightness on the building which i dont want.

Edited June 25, 2009 by sandiarch

[sandiarch]

This is some minor level adjustments in photoshop

[SandmanNinja]

I think the level adjustment image looks very good.

[mattclinch]

One more problem that i hv found with MR sun is...Ground/floor is receiving lot of light.brightness from MR sun...it doesnt look really good.. how can i get rid of this extra brightness for the ground/floor?

I know one option is to change the MR sun angle/time...but then that also changes the light/brightness on the building which i dont want.

 

If everything in your scene looks ok except the floor, then change the floor material.

[sandiarch]

thanks Mattclinch...i think u r correct...thats a better idea to change the color of floor textures..instead playing with other settings.

 

Here is the updated scene.

 

Again there is one problem here I can see some color bleeding right at the top walls above the entrance.. ..color of the roof is light green..and that color shade we can see on the walls...we can control this problem in V-Ray..how can we do that here in Mental Ray?

[thorsten hartmann]

hi

 

for color bleeding can you use a raytypeswitcher, but mental ray render correct the colors, i think you can try a whitepoint/color correction.

[sandiarch]

where are the settings for color correction in Mental ray?

more importantly how can i control color bleeding in mental ray?

[SandmanNinja]

http://www.mentalboutmax.com has a number of video tutorials on how to do this. Everything from the physically correct way to a number of short-cuts.

 

Great website - great videos.

[thorsten hartmann]

Hi

 

i can´t write link here but go to google and look for: color bleeding mrmaterials jeff patton

 

Whitepoint or Color correction is in the mr_exposure_photographic control of 3dsmax and please look in the very good manual of 3dsmax.

[sandiarch]

Thanks a lot Joel, Thorsten

thanks for those useful links.

[padre.ayuso]

As it has been said before fix it on post but you can also try changing the sky map under the environment map, I have done it before and it works fine. When it is said to fix it on post, it is meant that you save the picture with an alpha channel and change the sky map (which would be your alpha), as in get a nice sky from the web and put it as your sky (alpha channel). Hope this works out.

On the floor, try changing the floor material so it does not reflect so much sun or darken your map or something like that. It should be better once you do that.