for some reason if I add (in the shader tree) the ATTRIBUTE>COL from the vertex color property and channel it to a separate RGB (only making the R channel plug into a ramp node and then to the shader to RGB) I´m not getting a monochromatic channel from the red channel on EEVEE. What I get instead is the red color in the viewport.

How can I correctly make the red vertex color output a mono channel in red?

Also, I´ve been trying the same approach using ambient occlusion and feeding it to a separate rgb node into other channel, but then I don´t get the expected results: If I get a greyscale value on vertex driven by the red vertex color channel I want to multiply it using Ambient occlusion.

It is possible on Modo, Max and Softimage. What am I missing to do on Blender? Thanks. enter image description here

  • $\begingroup$ Here I am trying the monochromatic channel "fac" but if you do this on eevee 2.81 from the COLOR attribute node into image on separate RGB, you´ll get color on viewport. Please confirm if this is a bug or an expected behavior. Thanks. $\endgroup$ – Pierre Schiller Aug 14 '19 at 22:48
  • $\begingroup$ Have you tried using the mixRGB node set to saturation? The second color can just be grey. $\endgroup$ – Joseph Brandenburg Aug 15 '19 at 5:08
  • $\begingroup$ Interesting thought, but I need someone to confirm if this is either a bug or an expected behavior on viewport, as well. $\endgroup$ – Pierre Schiller Aug 15 '19 at 6:18
  • $\begingroup$ The nodes you're showing above should be grayscale. First, the attribute node should send grayscale out through the Fac output, then separate RGB should send a grayscale out through each channel, and color ramp should map whatever input value it gets to whatever value you set it to, in this case black or white. Even if you plug a color input into a ramp, you should get grayscale if the ramp values are grayscale. $\endgroup$ – Joseph Brandenburg Aug 15 '19 at 16:17
  • $\begingroup$ Yes sir, this what you mention is "expected behavior" on the viewport. Now, if you test it out on eevee, you´ll get a red channel on eevee viewport. Why? Could you please try and paste a url image to see your results, please? Thanks. $\endgroup$ – Pierre Schiller Aug 15 '19 at 16:56

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