Seeking Help with Noise Texture and Color Ramp Node in Snowman Material

[pterusgithub]

Hi there, I'm trying to create a surface material for a snowman (Christmas spirit, of course!). However, I'm struggling to understand why my code isn't working. The links between the noise_texture and mix nodes don't function as expected, although the rest seems to work fine.

While I'm at it, could you provide an example of how to use the color_ramp node? Specifically, how to change the colors, add stops, and so on?

Here’s the relevant part of the code I’m using:

with geon.ShaderNodes("snowman_texture"):
    # ----- Principled BSDF
    textu_coord = geon.snd.texture_coordinate().object
    mapping = geon.snd.mapping(vector=textu_coord)
    texture_01 = geon.snd.noise_texture(vector=mapping,scale=4).color
    texture_02 = geon.snd.noise_texture(vector=mapping,scale=500,roughness=0,detail=0, distortion = 0).color
    mix = geon.snd.mix(factor=0.1, a=texture_01,b=texture_02,data_type="RGBA").result
    colorramp = geon.snd.color_ramp(fac=mix).color
    ped = geon.snd.principled_bsdf(base_color=colorramp)
    # ----- To surface output
    ped.out()  

Thanks in advance!

[al1brn]

Hi,

Thanks for using my module.

• Regarding pb with mix, it seems that the last version of Blender changed its behavior. I corrected the bug on my side.
• Regarding the management of color ramp, you have to use directly the property of nodes with standard python: node._bnode.color_ramp.elements is the collection of stops.

However, to make things easier, I just implemented the set_stops method on the color ramp node in order to set up the stops.

When initializing a color ramp node, the key word argument stops has been added:

snd.color_ramp(stops=list of stops)

• A stop is basically a tuple (position, color)
• The position is a float between 0 and 1
• The color can be omitted, in that case the stop is a single float
• The color is a tuple of 4 floats but a single float or a triplet can be passed

To make the script work, your need to download the last version.

BR

with geon.ShaderNodes("snowman_texture"):
    # ----- Principled BSDF
    textu_coord = geon.snd.texture_coordinate().object
    mapping = geon.snd.mapping(vector=textu_coord)
    texture_01 = geon.snd.noise_texture(vector=mapping,scale=4).color
    texture_02 = geon.snd.noise_texture(vector=mapping,scale=500,roughness=0,detail=0, distortion = 0).color

    mix = geon.snd.mix(factor=0.1, a=texture_01,b=texture_02,data_type="RGBA").result

    colorramp = geon.snd.color_ramp(fac=mix).color

    colorramp.node.set_stops((0, (0, 0, 1)), (.5, 1), (.9, (1, 0, 0, .5))) 

    ped = geon.snd.principled_bsdf(base_color=colorramp)
    # ----- To surface output
    ped.out()  

[pterusgithub]

Hi al1brn, Thank you so much for this fix and the additional features you’ve provided. I truly appreciate your responsiveness and the effort you put into helping out. Wishing you a wonderful day!