How can I convert multiple faces of an object to light? [duplicate]

Question

I have create this spiral LED lamp.

The cylindrical part of spiral has six faces.

Four of them (back) are the non-transparent part and the rest two (front) supposed to be the plastic cap of the LED strip.

At those front faces I have add a material with an emission surface so to look like lit LED strip.

What I want to do is to make all those front faces to shed light to my scene. But not just to look glowed like first image. Is that possible?

Martynas Žiemys · Accepted Answer · 2021-02-09 14:57:44Z

2

Yes it is possible, you just assign a material with emission shader to the faces that you want to emit light and they will(in Cycles render).

answered Feb 9, 2021 at 14:57

Martynas Žiemys

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$\begingroup$ I have already done this at last step of my question and it just glow, doesn't give light to scene. $\endgroup$
– Simos Sigma
Commented Feb 9, 2021 at 17:26
2

$\begingroup$ Hello @Simon :). You're using Eevee, which has considerable limits on mesh lights. You need to bake indirect light for them to light the environment (or use Cycles rendering engine). $\endgroup$
– jachym michal
Commented Feb 9, 2021 at 19:16
$\begingroup$ Also, what do you expect the light to illuminate in your example? There is nothing around that can receive the light and it faces away from other parts of the object... $\endgroup$
– Martynas Žiemys
Commented Feb 9, 2021 at 21:32
$\begingroup$ Hello @JachymMichal :). I know about Eevee limits, I just wanted to know if I can make an object, a face etc, to shed light like blender lights do!!! $\endgroup$
– Simos Sigma
Commented Feb 10, 2021 at 9:56
$\begingroup$ @MartynasŽiemys in my example nothing, because what you see it's just isolated objects!!! :) $\endgroup$
– Simos Sigma
Commented Feb 10, 2021 at 9:58

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