ud18010andClaude Opus 4.8
a19e342bf4
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
32 lines
1.4 KiB
Python
32 lines
1.4 KiB
Python
"""UV 线框观察图渲染：把 UV 多边形（归一化 0-1 坐标）画成 PNG 供人工查阅。
|
|
在系统 Python（有 Pillow）中运行——Blender 自带 Python 无 PIL，故 UV 几何由
|
|
bl_decimate 导出为 JSON，本模块负责绘制。"""
|
|
from PIL import Image, ImageDraw
|
|
|
|
|
|
def _to_px(u, v, size, pad):
|
|
"""UV(0-1, 原点左下) -> 像素(原点左上)，含边距。"""
|
|
span = size - 2 * pad
|
|
x = pad + u * span
|
|
y = pad + (1.0 - v) * span # V 轴翻转：图像 y 向下
|
|
return x, y
|
|
|
|
|
|
def render_uv_png(polygons, out_png, size=1024, pad=8,
|
|
line=(30, 30, 30, 255), fill=(80, 140, 220, 64)):
|
|
"""polygons: [[[u,v], ...], ...] 每个多边形一组 UV 顶点。
|
|
白底 + 半透明填充 + 深色线框；写 PNG 到 out_png，返回 out_png。"""
|
|
base = Image.new("RGBA", (size, size), (255, 255, 255, 255))
|
|
overlay = Image.new("RGBA", (size, size), (0, 0, 0, 0))
|
|
draw = ImageDraw.Draw(overlay, "RGBA")
|
|
for poly in polygons:
|
|
pts = [_to_px(u, v, size, pad) for (u, v) in poly]
|
|
if len(pts) >= 3:
|
|
draw.polygon(pts, fill=fill)
|
|
for poly in polygons:
|
|
pts = [_to_px(u, v, size, pad) for (u, v) in poly]
|
|
if len(pts) >= 2:
|
|
draw.line(pts + pts[:1], fill=line, width=1)
|
|
Image.alpha_composite(base, overlay).convert("RGB").save(out_png, "PNG")
|
|
return out_png
|