Custom Defaults

from -- https://github.com/nortikin/sverchok/issues/1653

---

Node Defaults

When we (as coders) submit a node, we decide on sane defaults. Sometimes those defaults are not optimal for you (the user). If you find yourself always tweaking the parameters of a node before using it, then you might want to define custom node defaults.

We can now configure node defaults from a .json file.

datafiles/sverchok/node_defaults/node_defaults.json

{

    "SvGenFloatRange": {
        "props": [
            ["stop_", 1.0],
            ["count_", 20],
            ["mode", "FRANGE_COUNT"]
        ]
    },

    "ViewerNode2": {
        "props": [], 
        "function": "view3d.init_vdmk2"
    }
}

All we have to do is create key, value pair for each node.

• key: ( the node's bl_idname)

• value: Currently the value accepts two directives (but can be extended later)

  1. props ( push props in sequence with a list of prop_name, prop_value pairs. )
  2. function ( push a function: in the example below the function is referenced as view3d.init_vdmk2. read that as filename.function and filename shall be located in datafiles/sverchok/node_defaults/ )

datafiles/sverchok/node_defaults/view3d.py

import random
import colorsys

import bpy



def init_vdmk2(node):

    def fold_color(color, shift):
        h, s, v = colorsys.rgb_to_hsv(*color)
        return colorsys.hsv_to_rgb(shift, s, v)

    A = [0.938000, 0.948000, 0.900000, 1.000000]
    B = [0.500000, 0.752000, 0.899000, 1.000000]
    C = [0.030100, 0.488000, 0.899000, 1.000000]

    shift = random.random()
    node.vertex_colors = fold_color(A[:3], shift)
    node.edge_colors = fold_color(B[:3], shift)
    node.face_colors = fold_color(C[:3], shift)

    node.edge_width = 1.0
    node.vertex_size = 2.0

---

Each time you add a node, the node_default_dict is checked if the bl_idname has an entry.

• this has no effect on nodes that you duplicate, they clone their properties according to self.copy()
• this doesn't offer a visual way to set the preferences yet, that would be the next step.