ykcheungab
114 lines
4.5 KiB
Python
114 lines
4.5 KiB
Python
"""Convert camera-projected colour-patch cells to black capsule strokes.
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Run with Blender's source geometry and the existing texture job. This first
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camera-space prototype preserves the colour pattern's grid and visibility
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projection. It does not enforce a physical minimum stroke width.
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"""
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import argparse
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import json
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from pathlib import Path
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import sys
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import bpy
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sys.path.insert(0, str(Path(__file__).resolve().parent))
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from camera_grid_stroke_geometry import capsule_in_cell, projected_stroke_uv
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from patch_geometry import clip_rect
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from patch_projection import build_patch_geometry
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from random_patch_dd02c import (
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_clipped_polygons, _clipped_shapes, _prepare_mesh_object, _require_object,
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_require_uv_layer, fill_background, fill_polygon, save_png_image,
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write_pdf_vector, write_svg_vector,
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)
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def _args():
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argv = sys.argv[sys.argv.index("--") + 1:] if "--" in sys.argv else []
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parser = argparse.ArgumentParser()
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parser.add_argument("--job", type=Path, required=True)
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parser.add_argument("--output-dir", type=Path, required=True)
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parser.add_argument("--width-ratio", type=float, default=0.42)
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parser.add_argument("--length-ratio", type=float, default=0.84)
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return parser.parse_args(argv)
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def _pixel_polygon(uv_polygon, width, height):
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return [(u * (width - 1), v * (height - 1))
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for u, v in clip_rect(uv_polygon, 0.0, 1.0, 0.0, 1.0)]
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def _render(uv_name, geometry, settings, output_dir, width_ratio, length_ratio):
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width, height = settings["width"], settings["height"]
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nx, ny = settings["nx"], settings["ny"]
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seed = settings.get("seed") or 0
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image_name = f"CameraGridStroke_{uv_name}"
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if image_name in bpy.data.images:
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bpy.data.images.remove(bpy.data.images[image_name])
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image = bpy.data.images.new(image_name, width=width, height=height, alpha=True)
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pixels = list(image.pixels)
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fill_background(pixels, width, height, (0, 0, 0, 1))
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mesh_polygons = [_pixel_polygon(poly, width, height) for poly in geometry["mesh"]]
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mesh_polygons = [poly for poly in mesh_polygons if len(poly) >= 3]
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for poly in mesh_polygons:
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fill_polygon(None, pixels, width, height, poly, (1, 1, 1, 1))
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shapes = []
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outline_cache = {}
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for i, j, fragment, loop_uvs in geometry["camera_fragments"]:
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key = (i, j)
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if key not in outline_cache:
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outline_cache[key] = capsule_in_cell(
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i, j, nx, ny, seed, width_ratio, length_ratio)
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uv_poly = projected_stroke_uv(fragment, loop_uvs, outline_cache[key])
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pixel_poly = _pixel_polygon(uv_poly, width, height)
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if len(pixel_poly) < 3:
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continue
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shapes.append((pixel_poly, (0, 0, 0, 1)))
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fill_polygon(None, pixels, width, height, pixel_poly, (0, 0, 0, 1))
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image.pixels[:] = pixels
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image.update()
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base = output_dir / f"camera_grid_stroke_{uv_name}"
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save_png_image(image, base.with_suffix(".png"))
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page_mesh = _clipped_polygons(mesh_polygons, width, height)
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page_shapes = _clipped_shapes(shapes, width, height)
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vector = settings["vector"]
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vector_args = (width, height, vector["width_mm"], vector["height_mm"])
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write_svg_vector(base.with_suffix(".svg"), *vector_args,
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page_mesh, page_shapes, [], (0, 0, 0, 1), uv_name,
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artwork_label="stroke")
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write_pdf_vector(base.with_suffix(".pdf"), *vector_args,
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page_mesh, page_shapes, [], (0, 0, 0, 1),
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artwork_label="stroke")
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print(f"{uv_name}: {len(outline_cache)} cells, {len(shapes)} projected fragments")
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def main():
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args = _args()
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if not 0 < args.width_ratio <= args.length_ratio < 1:
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raise ValueError("require 0 < width-ratio <= length-ratio < 1")
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job = json.loads(args.job.read_text(encoding="utf-8"))
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settings = job["settings"]
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obj = _prepare_mesh_object(job["objects"]["mesh"])
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cam = _require_object(job["objects"]["camera"], "CAMERA", "Camera")
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names = [entry["uv_map"] for entry in job["outputs"]]
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for name in names:
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_require_uv_layer(obj, name)
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args.output_dir.mkdir(parents=True, exist_ok=True)
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args.output_dir = args.output_dir.resolve()
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geometry = build_patch_geometry(
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obj, cam, bpy.context.scene, bpy.context.evaluated_depsgraph_get(),
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names, settings["nx"], settings["ny"], settings["edge_sample_grid"],
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capture_camera_fragments=True,
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)
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for name in names:
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_render(name, geometry[name], settings, args.output_dir,
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args.width_ratio, args.length_ratio)
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if __name__ == "__main__":
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main()
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