Change material's emission intensity

Hi, I'm using this code to change a material's emission color and intensity:
material.SetColor("_EmissionColor", color * intensity);

And it works. Kinda... it changes the color correctly, however, the intensity seems to be random and not the same as the value I give, for example, if I set intensity = 3 I get intensity 5.08, and if I set intensity = 7 then I get intensity 6.3 (.. in the "HDR Color" picker)... what am I missing? how can I match the intensity value I give via the code to the one seen in the UI's HDR Color picker?

 

I don't mean to state the obvious, but is it because you're multiplying the intensity by whatever color is in your code?

 

Well.. I'm doing what is suggested here: https://forum.unity.com/threads/change-a-materials-emission-color-intensity-property.611206/

But it doesn't work as expected.

 

I didn't really know how it worked myself, but if you read through the rest of the thread, they talk about how the weird behavior, and how the intensity on the color picker works. The last post on the thread mentions the solution.

 

Yeah, saw it.. the Mathf.Pow "solution" doesn't work... more random numbers... ;/

 

Just some quick digging, found this thread, it might be the solution you're looking for. It looks like you need to subtract some arbitrary value before plugging it into the power of 2.

https://forum.unity.com/threads/set...intensity-in-script-to-match-ui-value.661624/

Hope it works for you.

 

Not sure if we are talking about the same thing, but I guess this picker is unable to retrive these values, because intensity slider is not part of color itself, so when you close the window you get some color like (3.1, 4.5, 2.2, 1) and it's hard to say what was your intensity you selected. For example mid gray (0.5) with multiplier 12 is the same as white (1) multiplied by 6. Also there is issue like this: https://issuetracker.unity3d.com/issues/hdrp-weird-conversion-of-fog-hdr-color-units

 

Thanks but I've been there also. It doesn't work.

 

Well, I got it to work, if someone finds this... it's the color value basically, it is needed to multiply the intensity by a pure and unaffected color value. So material.GetColor("_EmissionColor") is not good (unless the intensity is set to zero so the color value will be unaffected). The "pure" color value should be saved in a local variable and be reused with each intensity change.

Example:
Set intensity to 3.5 of a reddish color:
material.SetColor("_EmissionColor", new Vector4(0.749f, 0.059f, 0.059f, 1.000f) * Mathf.Pow(2.0F, 3.5f))