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@tamask
Created January 29, 2019 11:03
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Simple tool for packing colors into UV maps
'''
Simple tool for packing colors into UV maps
'''
import bpy
import math
import mathutils
def v2_to_float(v2, precision=4096):
'''Pack two 0-1 float values into a single float'''
p = precision - 1
x, y = v2
x = math.floor(x * p)
y = math.floor(y * p)
f = (x * precision) + y
return f
def float_to_v2(f, precision=4096):
'''Unpack two 0-1 float values from a single float'''
p = precision - 1
x = math.floor(f / precision) / p
y = (f % precision) / p
return x, y
def pack_rgba(obj, uvmap_name, color_name, alpha_name=None, precision=4096):
uvmap = obj.data.uv_layers[uvmap_name].data
color = obj.data.vertex_colors[color_name].data
if alpha_name is None:
for loop_index, uv_loop in enumerate(uvmap):
r, g, b, a = color[loop_index].color
uv_loop.uv.x = v2_to_float((r, g), precision=precision)
uv_loop.uv.y = v2_to_float((b, a), precision=precision)
else:
alpha = obj.data.vertex_colors[alpha_name].data
for loop_index, uv_loop in enumerate(uvmap):
r, g, b, a = color[loop_index].color
a = mathutils.Color((alpha[loop_index].color[:3])).v
print(a)
uv_loop.uv.x = v2_to_float((r, g), precision=precision)
uv_loop.uv.y = v2_to_float((b, a), precision=precision)
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