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Have HDRI light for indoors closed, will be cool for have speed render!
is it possible to have this feature in octane ?

im not sure what you mean...

hdri picture like lights source for illuminance a room without windows or holes

hdri is a speed way for have realistic shadows on a object my request is found a way for use this tecnique for render closed enviroment
without use lights emitter

Remove the walls outside your camera FOV

Sorry, I didnt explain well.
I know what an HDRI is and Octane does have this feature.

do you just want them to give you an HDRI of an indoor room?
you can find an HDRI like this online and use it. HDRI Labs has a lot of free HDRIs.

I have several I use for "indoor" scenes and dont use any lights, except sometimes a key light for more lighting control.
Ill just use one wall behind what I'm rendering.

And of course you can make your own wonderful custom (for any given scene/situation) HDRI with the spherical camera now...

if you try to render inside a cube with a hdri whats happen ?

Andygraph3D wrote:if you try to render inside a cube with a hdri whats happen ?

all what should happeni in real life if Your cube is closed, and the light will not penetrate through materials - then you should get dark picture. if You have openings, like doors, windows or simply open walls' youll get pretty much most realistic lighting, depending of course on Your chosen HDR.

overall.. simply make wall, flor, and ceilings.. find a proper environment and be happy with way faster rendering speed..don't model entire environment, 'cos will influence rendering speed - open scenes do render faster. unless =) you really need that =) but then probably it's better to use daylight system - it's very flexivble, so you can get any lighting You want =)

about the hdri "invisible sphere" inside octane ...
how i can resize it ? When i setting and import the enviroment map i see it many big ...

I dont think you can change the size of the sphere, but you can change the scale of the HDRI image in Octane