OTOY Forums

OK, this is bugging me me for quite a while now:
in the DS plugin the brightness of an emissive object is dependent on it's size and not it's energy, which is, as far as I know, not physically correct, and makes it impossible to do a physical correct scene lighting: if I want a 100W light bulb and I convert an existing mesh as emitter or place a sphere as proxy, the radiant intensity is dependent on the mesh size and not Watt value.
I made a quick comparison between Poser and DAZ (both the same scene, only the size of the emitter is changed)

Poser (scale independant, physically correct) DAZ (brightness depends on emitter mesh scale) Emitter values are in both applications and all cases the same: Is there a setting I'm missing or is this a bug?

Change the "Surface Brightness" parameter controls this.

The Octane Standalone tooltip for this parameter is

If enabled, "power" specifies the brightness of the surface and not the total emitted power, i.e. the brightness of the emitter is independent of the area of the surface

Also keep in mind that when you click the Final button, all geometry in the scene is merged into one Octane Mesh node - and this can change the brightness of emitters.

Paul

Thanks, Paul, I'll have a look at this.

face_off wrote:Also keep in mind that when you click the Final button, all geometry in the scene is merged into one Octane Mesh node - and this can change the brightness of emitters.

Paul

Hm - but since the emitter gets assigned to a material zone (UV) , this shouldn't matter, right?
I'll do some tests.

I suggest waiting for the next release of the plugin before testing, as Octane 3.07 TEST 4 has some issues when rendering with the Final button enabled.

Paul

I'm cool with that