Custom-Defaults.md

+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
+```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
+```python
+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.
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