# Is it always necessary to add a bitmap filter attribute for tiled EXRs? **URL:** \ **Category:** General\ **Created:** [July 8, 2015, 10:44am UTC](https://forums.chaos.com/t/is-it-always-necessary-to-add-a-bitmap-filter-attribute-for-tiled-exrs/54497 "2015-07-08T10:44:08Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![re\_FORM](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/re_form/32/36295_2.png) [@re\_FORM](https://forums.chaos.com/u/re_FORM)\ **Post date:** [July 8, 2015, 10:44am UTC](https://forums.chaos.com/t/is-it-always-necessary-to-add-a-bitmap-filter-attribute-for-tiled-exrs/54497/1 "2015-07-08T10:44:08Z")
I’m trying to optimise a scene at the moment, and one thing I’ve not got a handle on is where I need to specify vray overrides in Maya. We have a very heavy scene with many 8k textures saved to tiled EXR format; and I wasn’t sure if I need to go through every loader and add the bitmap filter attribute, or whether vray automatically filters tiled EXRs correctly to enable mipmap behaviour. ---
**Author:** ![vlado](https://avatars.discourse-cdn.com/v4/letter/v/779978/32.png) [@vlado](https://forums.chaos.com/u/vlado)\ **Post date:** [July 8, 2015, 10:56am UTC](https://forums.chaos.com/t/is-it-always-necessary-to-add-a-bitmap-filter-attribute-for-tiled-exrs/54497/2 "2015-07-08T10:56:06Z")
By default tiled EXR’s should be filtered correctly; just make sure that in the File nodes, the filtering is not set to Off. There should be no need to add V-Ray attributes to everything. Best regards, Vlado ---
**Author:** ![re\_FORM](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/re_form/32/36295_2.png) [@re\_FORM](https://forums.chaos.com/u/re_FORM)\ **Post date:** [July 8, 2015, 11:12am UTC](https://forums.chaos.com/t/is-it-always-necessary-to-add-a-bitmap-filter-attribute-for-tiled-exrs/54497/3 "2015-07-08T11:12:07Z")
Thanks Vlado, that’s a relief! Is there any great need to play with the filtering these days at all? I’m a bit confused by the way Maya has multiple competing filtering settings within each loader and it’s not clear what takes precedence over what; ie “file attributes - filter type and pre filter” Leave as default, or do we need to change to type = mipmap? Does VRay override this by default anyway meaning that anything other than “off” effectively means “on” Is there any reason to use pre-filter? (other than to perform a severe blur) “Effects - Filter” - this is where we control the amount of filtering VRay uses. "Extra VRay Attributes " “- override texture filter” - From what you say, this is on by default without needing to add the attribute? “- texture filter” (type) - If I want to use the mipmap feature of tiled EXRs, am I forced to use “smooth with mipmaps” or are any of the other options valid? “- smooth method” - Is the default of this, the default that VRay uses when you set the “file attributes - filter type” to anything other than none, even if this attribute is not added? Sorry for asking what should be basic stuff, I think I’ve ‘got’ it, but just want to be sure I’m not making any wrong assumptions. Thanks p. ---
**Author:** ![ivaylo.ivanov](https://avatars.discourse-cdn.com/v4/letter/i/eb8c5e/32.png) [@ivaylo.ivanov](https://forums.chaos.com/u/ivaylo.ivanov)\ **Post date:** [July 8, 2015, 12:01pm UTC](https://forums.chaos.com/t/is-it-always-necessary-to-add-a-bitmap-filter-attribute-for-tiled-exrs/54497/4 "2015-07-08T12:01:57Z")
V-Ray doesn’t support pre filetering. If you turn it on, its value will be multiplied by the Filter in the Effect roll-out. This filter radius will affect only mipmaps and SAT. In the help about the “Texture Filter” attributes, there is a link called “Maya to V-Ray attributes” with short info about how we translate the “Filter Type” attribute. ---
**Author:** ![re\_FORM](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/re_form/32/36295_2.png) [@re\_FORM](https://forums.chaos.com/u/re_FORM)\ **Post date:** [July 10, 2015, 9:19am UTC](https://forums.chaos.com/t/is-it-always-necessary-to-add-a-bitmap-filter-attribute-for-tiled-exrs/54497/5 "2015-07-10T09:19:12Z")
Thanks for the clarifications Ivaylo!