Old Building Interior need help.

[Eezo]

Ok this is something I have been working on for university, I am doing a short walkthrough of a scrap yard and I am particularly focussing on the interior of this old building.

 

I am having trouble with the over exposure you can see in the gap I have between the first and second floor, I cant' seem to get rid of the over exposure, I want the gap to be there but I don’t want it this bright.

 

I have one vray light placed in the centre of this gap with a multiplier of three, if I move it below the ceiling The entire ceiling becomes over exposed.

 

I am stuck so any help would be greatly appreciated, I am trying to keep render times down as well.

 

Oh also I am sure you will notice the images look slighly grainy, how would you suggest I fix this problem? I am new to vray and this is a bit of a lurning curve for me.

 

Cheers.

[DennisHolland]

Did you check 'invisible' in your vraylight rollout and turned (vray)shadows on? Could be that the overexposed look is just your vrayplane and not any hard light bouncing in. Also, make sure that the second floor hasd a roof and not only the empty environment. Set the environment to a blueish color.

 

Post the next one,

Dennis

[Eezo]

Thanks for the reply. I had not checked invisible, I new it would end up being something silly like that.

 

Now that’s sorted out I can sort out some of the texture issues.

 

Ill post another image and maybe I can get some more general crits?

[Tim Saunders]

This looks like a fun project. Your texture maps seem to have pretty low resolution. You might try to get some better samples. Also, the boards on the middle of the floor don't seem to be casting any shadows.

[Nic H]

I think it could really do with a different lighting approach. Possibly a direct light coming through the window to get some more contrast, and then turn down the vray ceiling light. Even try bumping up the enivironment light to get some more bluish ambient light coming in the second window.

 

The textures need work, and you need to pay attention to the scale of the floorboards (a bit big). Try http://www.accustudio.com/exchange/textures.php?dir= for some better hires textures, they have some good floorboards.

 

Maybe a light globe with a decent IES on a powerlead hangin from teh rafters to help with the contrast? Some more 'clutter' would help to cast soem more shadows around, old table, broken chair, general rubble.

 

Its a good start, good luck with it. Making 'dirty' looking spaces is always a challenge!

[Eezo]

Thank's for the replies. As you can see I have changed the lighting, it's now more of a night time scene with lights in the room to give the lighting.

 

I have changed a few of the textures and I intend to change quite a bit more but my main problem has now becom render time.

 

I rendered the light cache and irmap at half the size and then set the next render up to double the size and used the light cache and ir maps I had just saved but even with this method it still to about 20 mins to render the image and it took quite a while to render the saved maps as well.

 

I am doing a walkthrough so I need to get render times down quite a bit, please help?

http://img99.imageshack.us/img99/1365/iestestrender3az.jpg

[mahorela]

the best way to reduce rendering times is to prerender you irradiance map on every 10th to 20th frame or so.

 

-in your render dialogue, common settings, make sure you use the correct image size, make sure your rendering all frames and put 10 or 20 in the nth frame box and do not save the render.

 

-in your vray settings, adaptive aliasing click on "do not render final image"

 

-head down to your irradiance settings and make sure the multiframe incremental and autosave are switched on and ensure that you have named and saved the irradiance map file.

 

-then click render

 

-the renderer will say that frames may be lost or whatever, but we're not trying to render the image, just the irradiance map.

 

-let that go through then ensure that the renderer is rendering every frame (put 0 in nth frame), make sure it is saving your animation, uncheck "dont render final image" in AA settings and in your irradiance map settings click on "from file" and ensure the file you specified previously is selected.

 

help so much to pre render the irradiance map and cuts down heaps on artifacts etc.

[Eezo]

Thanks that helps alot, can I use the same method for the light cache or do I have to render this on every single frame?

[mahorela]

yes you can

 

under the light cache dialogue just click on flythrough and autosave and specify a file name.

 

I usually do it at the same time as I precalculate the irradiance map

 

Note: If you start getting strange scintillation flickering on some edges, finer details or reflective surfaces you need to lower your threshold in your AA settings (down to .05 or so). You can do this after you have pre calculated your maps as AA is applied post light mapping.