93 lines
2.7 KiB
GDScript
93 lines
2.7 KiB
GDScript
@tool
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extends MeshInstance2D
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@export var pixels_per_subdivision: float = 10.0 # 每个细分包含的像素数
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@export_tool_button("重置 mesh") var reset_mesh = create_rope_mesh
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func create_rope_mesh():
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var texture_size = texture.get_size()
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var texture_width = texture_size.x
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var texture_height = texture_size.y
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var aspect_ratio = texture_width / texture_height
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# 整体缩放系数
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var scale_factor := float(texture_height)
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# 根据纹理宽度和期望的细分密度计算水平细分数
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var horizontal_subdivisions = max(int(texture_width / pixels_per_subdivision), 1000)
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# 垂直细分较少，因为麻绳主要是水平变形
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var vertical_subdivisions = max(int(texture_height / pixels_per_subdivision), 10)
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# 计算实际显示尺寸（保持纹理比例）
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var display_width = aspect_ratio * scale_factor
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var display_height = 1.0 * scale_factor
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var array_mesh = ArrayMesh.new()
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var arrays = []
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arrays.resize(Mesh.ARRAY_MAX)
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var vertices = PackedVector2Array()
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var uvs = PackedVector2Array()
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var indices = PackedInt32Array()
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# 创建网格顶点
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for y in range(vertical_subdivisions + 1):
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for x in range(horizontal_subdivisions + 1):
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var u = float(x) / float(horizontal_subdivisions)
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var v = float(y) / float(vertical_subdivisions)
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# 顶点位置（居中）
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var vertex_x = (u - 0.5) * display_width
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var vertex_y = (v - 0.5) * display_height
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vertices.append(Vector2(vertex_x, vertex_y))
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uvs.append(Vector2(u, v))
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# 创建三角形索引
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for y in range(vertical_subdivisions):
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for x in range(horizontal_subdivisions):
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var top_left = y * (horizontal_subdivisions + 1) + x
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var top_right = top_left + 1
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var bottom_left = (y + 1) * (horizontal_subdivisions + 1) + x
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var bottom_right = bottom_left + 1
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# 第一个三角形
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indices.append(top_left)
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indices.append(bottom_left)
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indices.append(top_right)
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# 第二个三角形
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indices.append(top_right)
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indices.append(bottom_left)
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indices.append(bottom_right)
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arrays[Mesh.ARRAY_VERTEX] = vertices
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arrays[Mesh.ARRAY_TEX_UV] = uvs
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arrays[Mesh.ARRAY_INDEX] = indices
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array_mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
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mesh = array_mesh
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print(
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(
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"创建网格: %dx%d 细分, 纹理尺寸: %dx%d, 显示尺寸: %.2fx%.2f"
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% [
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horizontal_subdivisions,
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vertical_subdivisions,
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texture_width,
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texture_height,
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display_width,
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display_height
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]
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)
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)
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# 运行时调整隆起参数的便捷方法
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func set_bulge(pos: float, height: float):
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if material and material is ShaderMaterial:
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material.set_shader_parameter("bulge_position", pos)
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material.set_shader_parameter("bulge_height", height)
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# material.set_shader_parameter("bulge_height", height)
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# material.set_shader_parameter("bulge_width", width)
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