Nathan
123 lines
4.5 KiB
Python
123 lines
4.5 KiB
Python
import bpy
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import gpu
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import math
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import mathutils
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from bpy_extras import view3d_utils
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from mathutils import Vector
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from gpu_extras.batch import batch_for_shader
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#### ------------------------------ FUNCTIONS ------------------------------ ####
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def draw_shader(type, color, alpha, coords, size=1, indices=None):
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"""Sets up and draws a batch for a given GPU shader type."""
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gpu.state.blend_set('ALPHA')
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if type == 'POINTS':
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gpu.state.program_point_size_set(False)
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gpu.state.point_size_set(size)
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shader = gpu.shader.from_builtin('UNIFORM_COLOR')
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shader.uniform_float("color", (color[0], color[1], color[2], alpha))
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batch = batch_for_shader(shader, 'POINTS', {"pos": coords}, indices=indices)
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elif type in 'LINES':
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gpu.state.line_width_set(size)
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shader = gpu.shader.from_builtin('POLYLINE_UNIFORM_COLOR')
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shader.uniform_float("viewportSize", gpu.state.viewport_get()[2:])
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shader.uniform_float("lineWidth", size)
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shader.uniform_float("color", (color[0], color[1], color[2], alpha))
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batch = batch_for_shader(shader, 'LINES', {"pos": coords}, indices=indices)
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elif type in 'LINE_LOOP':
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shader = gpu.shader.from_builtin('POLYLINE_UNIFORM_COLOR')
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shader.uniform_float("viewportSize", gpu.state.viewport_get()[2:])
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shader.uniform_float("lineWidth", size)
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shader.uniform_float("color", (color[0], color[1], color[2], alpha))
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batch = batch_for_shader(shader, 'LINE_LOOP', {"pos": coords})
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if type == 'SOLID':
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gpu.state.depth_test_set('NONE')
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shader = gpu.shader.from_builtin('UNIFORM_COLOR')
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shader.uniform_float("color", (color[0], color[1], color[2], alpha))
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batch = batch_for_shader(shader, 'TRIS', {"pos": coords}, indices=indices)
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batch.draw(shader)
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gpu.state.point_size_set(1.0)
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gpu.state.line_width_set(1.0)
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gpu.state.blend_set('NONE')
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def draw_bmesh_faces(faces, world_matrix) -> tuple[list, list]:
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"""
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Gets world-space vertex pairs and indices from `bmesh` faces.
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Returns the list of 3D vertices and the list of triangle indices to be used in GPU batch.
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Adapted from "Blockout" extension by niewinny (https://github.com/niewinny/blockout).
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"""
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if not faces:
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return None, None
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vertices = []
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indices = []
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vert_index_map = {}
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vert_count = 0
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for face in faces:
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face_indices = []
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# Collect unique vertices only (avoid storing verts that are shared by multiple faces).
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# (NOTE: Iterating over face corners because unlike `face.verts` they're ordered).
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for loop in face.loops:
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vert = loop.vert
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if vert not in vert_index_map:
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co = world_matrix @ Vector(vert.co)
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vertices.append(co)
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vert_index_map[vert] = vert_count
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face_indices.append(vert_count)
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vert_count += 1
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else:
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face_indices.append(vert_index_map[vert])
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# Triangulate face and map local indices to global vertex indices.
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if len(face_indices) >= 3:
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try:
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face_verts_co = [vertices[idx] for idx in face_indices]
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tris = mathutils.geometry.tessellate_polygon([face_verts_co])
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for tri in tris:
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indices.append((face_indices[tri[0]], face_indices[tri[1]], face_indices[tri[2]]))
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except:
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# Fallback to simple fan triangulation if tessellation fails.
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for i in range(1, len(face_indices) - 1):
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indices.append((face_indices[0], face_indices[i], face_indices[i + 1]))
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return vertices, indices
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def draw_circle_billboard(context, origin: Vector, radius: float, segments: int) -> list:
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"""
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Draws a view-facing circle in the world-space around the given origin Vector.
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Returns the list of 3D vertices.
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"""
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region = context.region
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rv3d = context.region_data
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origin_2d = view3d_utils.location_3d_to_region_2d(region, rv3d, origin)
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radius = min(radius, 25)
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vertices = []
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for i in range(segments + 1):
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angle = i * (2 * math.pi / segments)
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# Add offset in screen-space.
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offset_x = radius * math.cos(angle)
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offset_y = radius * math.sin(angle)
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vert_2d = Vector((origin_2d.x + offset_x, origin_2d.y + offset_y))
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# Convert back to world-space.
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vert_3d = view3d_utils.region_2d_to_location_3d(region, rv3d, vert_2d, origin)
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vertices.append(vert_3d)
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return vertices
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