Mesh

class Mesh(Geometry):

from aspose.threed import Scene
from aspose.threed.entities import Mesh
from aspose.threed.utilities import Vector4

# Create the mesh and add three vertex positions
# IMPORTANT: control_points returns a copy of the internal list.
# Append to _control_points directly — appending to control_points discards the vertex.
# This is a known library limitation; a public mutation API does not yet exist.
mesh = Mesh()
mesh._control_points.append(Vector4(0.0, 0.0, 0.0, 1.0))   # vertex 0
mesh._control_points.append(Vector4(1.0, 0.0, 0.0, 1.0))   # vertex 1
mesh._control_points.append(Vector4(0.5, 1.0, 0.0, 1.0))   # vertex 2

# Define one triangle face using vertex indices
mesh.create_polygon(0, 1, 2)

# Attach to a scene and save
scene = Scene()
scene.root_node.create_child_node("triangle", mesh)
scene.save("triangle.stl")

from aspose.threed import Scene
from aspose.threed.entities import Mesh
from aspose.threed.utilities import Vector4

mesh = Mesh()
# Four corners of a unit square in the XZ plane
# Use _control_points to mutate the backing list (control_points returns a copy)
for x, z in [(0, 0), (1, 0), (1, 1), (0, 1)]:
    mesh._control_points.append(Vector4(float(x), 0.0, float(z), 1.0))

# One quad face
mesh.create_polygon(0, 1, 2, 3)
print(f"Polygons before triangulate: {mesh.polygon_count}")  # 1

triangulated = mesh.triangulate()
print(f"Polygons after triangulate: {triangulated.polygon_count}")  # 2

scene = Scene()
scene.root_node.create_child_node("quad", triangulated)
scene.save("quad.glb")

mesh = Mesh()
# ... populate control_points ...
mesh.create_polygon(0, 1, 2)       # triangle
mesh.create_polygon(0, 1, 2, 3)    # quad
print(mesh.polygon_count)          # 2

from aspose.threed.entities import Mesh
from aspose.threed.utilities import Vector4

mesh = Mesh()
# Use _control_points to mutate the backing list (control_points returns a copy)
for v in [(0,0,0), (1,0,0), (1,1,0), (0,1,0)]:
    mesh._control_points.append(Vector4(*v, 1.0))
mesh.create_polygon(0, 1, 2, 3)   # one quad

tri_mesh = mesh.triangulate()
print(tri_mesh.polygon_count)      # 2

from aspose.threed.entities import Geometry

def ensure_mesh(geom: Geometry):
    return geom.to_mesh()

from aspose.threed.entities import Mesh, VertexElementType, MappingMode, ReferenceMode
from aspose.threed.utilities import Vector4

mesh = Mesh()
# Use _control_points to mutate the backing list (control_points returns a copy)
mesh._control_points.append(Vector4(0, 0, 0, 1))
mesh._control_points.append(Vector4(1, 0, 0, 1))
mesh._control_points.append(Vector4(0.5, 1, 0, 1))
mesh.create_polygon(0, 1, 2)

normal_element = mesh.create_element(
    VertexElementType.NORMAL,
    MappingMode.CONTROL_POINT,
    ReferenceMode.DIRECT,
)

from aspose.threed.entities import Mesh, TextureMapping, MappingMode, ReferenceMode

mesh = Mesh()
# ... define control_points and polygons ...
uv_element = mesh.create_element_uv(
    TextureMapping.DIFFUSE,
    MappingMode.POLYGON_VERTEX,
    ReferenceMode.INDEX_TO_DIRECT,
)