加入摄像机网格笔画方向优化实验

用邻域差异筛选方向并保留原随机模式。已通过单元测试、纹理重现检查和多分辨率光流探针。

blender/scripts/camera_grid_stroke_geometry.py

@@ -6,12 +6,19 @@ import random
 from patch_geometry import clip_halfspace, interpolate_uv
 
 
-def capsule_in_cell(i, j, nx, ny, seed, width_ratio=0.42, length_ratio=0.84):
+def stroke_angle(i, j, seed):
+    """Return the original seeded orientation in radians, modulo a half-turn."""
+    rng = random.Random((seed * 1000003 + i * 9176 + j * 6113) & 0xFFFFFFFF)
+    return rng.uniform(0, math.pi)
+
+
+def capsule_in_cell(i, j, nx, ny, seed, width_ratio=0.42, length_ratio=0.84,
+                    angle=None):
     """Return a round-ended stroke wholly inside one normalized camera cell."""
     if not 0 < width_ratio <= length_ratio < 1:
         raise ValueError("require 0 < width_ratio <= length_ratio < 1")
-    rng = random.Random((seed * 1000003 + i * 9176 + j * 6113) & 0xFFFFFFFF)
-    angle = rng.uniform(0, math.pi)
+    if angle is None:
+        angle = stroke_angle(i, j, seed)
     radius = width_ratio / 2
     half_body = (length_ratio - width_ratio) / 2
     outline = []