Argh ! Light/ store with irradiance map Headache ! Help

[Dariusz Makowski (Dadal)]

Heya

So, I've started to experiment again with vray settings... got just off project so I have few hours for fun... Anyway I wanted to finally clear out my mid off that store with irradiance map in Lights...

The difference in render is that :

Without = 11 min
With = 3 min

Now the only known issue is that we are losing only specular... right?

So I got theory that I can get it back by simply doing blend material>and blur up the reflection simply... haven't tested yet but maybe it will do the trick...

However I did some goggling around and I've noticed a lot of more stuff however they kinda mixed up thing in my head and got lost lol...

Basically this topic > http://www.chaosgroup.com/forums/vbulletin/showthread.php?48269-So-Vray-is-quot-SOOOO-FASSSSSTTT-quot-(and-not-too-grainy-btw)....-if&highlight=store+irradiance+map<

Where can I find ''use light cache for glossy rays'' ?? // Ignore found it already.

But then I found this topic http://www.chaosgroup.com/forums/vbu...at+glossy+rays

And now I'm completely lost. Can any1 spare me few mins and tell me (no need to explain tbh) how to set up render so I can cut down render times from 11 min to 3 min ?

Below attachment

Left Rim = Store with irradiance map Off
Right Rim = On

Thanx for help !

[3DMK]

Heya



The difference in render is that :

Without = 11 min
With = 3 min

Now the only known issue is that we are losing only specular... right?
You also loose shadow detail


And now I'm completely lost. Can any1 spare me few mins and tell me (no need to explain tbh) how to set up render so I can cut down render times from 11 min to 3 min ?

There's no magic fix here I'm afraid.
Every little trick you learn is just another way to reduce the render time albeit with a reduction in final output quality.
Take even the irradiance map as an example----It is a trick [although a very ingenious one] to get GI to render faster. The best quality GI is brute force but a lot of people can't afford the render time or extra machines to render this way so the irradiance map & Light Cache are techniques invented to allow reasonable render times.
In the end it's all about what sacrifices you are willing/or need to make to get the job done.
Hope this helps


Thanx for help !

BTW - There is a big difference in the results in your images, so if you can afford the extra time....keep store with IrradMap OFF

[Dariusz Makowski (Dadal)]

Heya,

No need shadows tbh. All I need is Specular/Diff/Reflection.. doh would be heaven then... anyway I've menaged to cut down 50% on rendertimes just by increasing adaptive sampling from 0.01 to 0.025... on 10k renders its quite fine once u print it and so on so wop wop.... wish I could use that store with irr map Id cut it down by 150% lol :c, Hope VrayGPU come son !

[joconnell]

Might be worth having some geometry the same size as the vray lights with a vray light material using the same value as your lights multipliers - keep these hidden while making your irmap files, then unhide them for your final render? You'll still get some extra hit render time wise with the extra rays needed but it might not be as much.