Texture vs blackbody emission

[thanulee]

Hi, im a bit confused since both nodes have distribution and texture. Can u explain me the difference cause in manual is same? thanks

[bepeg4d]

Hi thanulee,
the blackbody emission node is designed for artificial lights where the color of emission is defined by the temperature in Kelvin.
The Texture slot works also as Efficiency of emission, and by default is set at 0.025 like the classic filament bulbs.
You need to set both values to mimic the behavior of different emitters types.
Plese have a look at these discussions about Watt and Lumens for a more detailed explanation:
viewtopic.php?f=9&t=62045&p=317233&hilit=lumen#p317233
viewtopic.php?f=30&t=42275&p=313725&hilit=lumen#p313725

On the other side, the Texture emission node is designed to assign a color (possibly gaussian) or a texture in the Texture slot, for mimic special emitters like colored neon, gelatines, tv screen, and so on.
Note that the power should be reduced to match the efficiency of the emitter to mimic.
ciao beppe

[thanulee]

Thank u i ll take a closer look at those. Btw, if i wanna add an hdr image as a softbox for example, which of the two i use and where i put hdr? thanks

[bepeg4d]

Hi thanulee,
use a Texture Emission node, with the HDR in Texture slot, inside an ImageTexture node and Gamma 1.
ciao beppe

[thanulee]

Thank u very much for the help! One more question if its not a problem hehe. Is there possible to make a dome light with a gradient instead of an hdr?

[Studio21]

yes u can. use a textured environment and plug a gradient in the texture slot

[bepeg4d]

Hi,
yes sure, you can use any kind of node combination in the Environment node, for example a Falloff node at 90°:

ciao Beppe