# Irradiance x Resolution...

**URL:** <https://forums.chaos.com/t/irradiance-x-resolution/2776>\
**Category:** General\
**Created:** [February 6, 2004, 9:02am UTC](https://forums.chaos.com/t/irradiance-x-resolution/2776 "2004-02-06T09:02:31Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![doriziofilho](https://avatars.discourse-cdn.com/v4/letter/d/8c91f0/32.png) [@doriziofilho](https://forums.chaos.com/u/doriziofilho)\
**Post date:** [February 6, 2004, 9:02am UTC](https://forums.chaos.com/t/irradiance-x-resolution/2776/1 "2004-02-06T09:02:31Z")

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Please…  
i have to do one pic with 2480 x 1744 but i dont know  
wich settings put in min and max rate in irradiance map…  
actualy i have testing with high (-3 and 0) but is very very slowly…  
anybody can tell me what can i do??

thanx a lot

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**Author:** ![TOBTHREEDEE](https://avatars.discourse-cdn.com/v4/letter/t/ccd318/32.png) [@TOBTHREEDEE](https://forums.chaos.com/u/TOBTHREEDEE)\
**Post date:** [February 6, 2004, 9:06am UTC](https://forums.chaos.com/t/irradiance-x-resolution/2776/2 "2004-02-06T09:06:07Z")

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do you have materials with glossiness?

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**Author:** ![natty](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/natty/32/22731_2.png) [@natty](https://forums.chaos.com/u/natty)\
**Post date:** [February 6, 2004, 9:07am UTC](https://forums.chaos.com/t/irradiance-x-resolution/2776/3 "2004-02-06T09:07:56Z")

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there is a rule of thumb .. but i just normaly render the image half the size, save the IRR map then render your image at the size you want from the saved map 😉

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**Author:** ![doriziofilho](https://avatars.discourse-cdn.com/v4/letter/d/8c91f0/32.png) [@doriziofilho](https://forums.chaos.com/u/doriziofilho)\
**Post date:** [February 6, 2004, 9:27am UTC](https://forums.chaos.com/t/irradiance-x-resolution/2776/4 "2004-02-06T09:27:07Z")

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thanx… i will try… and will post result…

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**Author:** ![flipside](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/flipside/32/12787_2.png) [@flipside](https://forums.chaos.com/u/flipside)\
**Post date:** [February 7, 2004, 2:23pm UTC](https://forums.chaos.com/t/irradiance-x-resolution/2776/5 "2004-02-07T14:23:49Z")

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> [@natty](#):
>
> there is a rule of thumb .. but i just normaly render the image half the size, save the IRR map then render your image at the size you want from the saved map 😉

Hey that’s exactly what the min max settings do for you 🙂

There’s lots of info on www.vray.info about these settings.

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**Author:** ![DP](https://avatars.discourse-cdn.com/v4/letter/d/ecd19e/32.png) [@DP](https://forums.chaos.com/u/DP)\
**Post date:** [February 10, 2004, 12:30am UTC](https://forums.chaos.com/t/irradiance-x-resolution/2776/6 "2004-02-10T00:30:55Z")

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i actually find playing with the hsph subdivs and the interp amount can greatly reduce times allowing a higher resolution map to be created.

when doing previews i use -3-3 (Antialising off)on the map and 15,15 on the hsphr and interp…when going to high res (4000x3000) i use -2,-1 on the irmap, wind hsphere up to 30 or 40 and interp from 50-100…antialiaing is 2 & 4, i find 6 is nicer but it has a noticable effect on rendertimes.

I also force glossies to have one bounce.

I found rendering bucket ir map would shave perhaps 10-20% off render time, but i couldnt guarentee i wouldnt see artifacting on the GI on where the buckets met.