panda3d/tests/gobj/test_geom_primitives.py

from panda3d import core


def test_geom_triangles_adjacency():
    prim = core.GeomTriangles(core.GeomEnums.UH_static)
    prim.add_vertex(0)
    prim.add_vertex(1)
    prim.add_vertex(2)
    prim.close_primitive()
    prim.add_vertex(2)
    prim.add_vertex(1)
    prim.add_vertex(3)
    prim.close_primitive()

    adj = prim.make_adjacency()
    verts = adj.get_vertex_list()
    assert tuple(verts) == (
        0, 0, 1, 3, 2, 2,
        2, 0, 1, 1, 3, 3,
    )


def test_geom_lines_adjacency():
    prim = core.GeomLines(core.GeomEnums.UH_static)
    prim.add_vertex(0)
    prim.add_vertex(1)
    prim.close_primitive()
    prim.add_vertex(1)
    prim.add_vertex(2)
    prim.close_primitive()
    prim.add_vertex(2)
    prim.add_vertex(3)
    prim.close_primitive()

    adj = prim.make_adjacency()
    verts = adj.get_vertex_list()
    assert tuple(verts) == (
        0, 0, 1, 2,
        0, 1, 2, 3,
        1, 2, 3, 3,
    )


def test_geom_linestrips_adjacency():
    prim = core.GeomLinestrips(core.GeomEnums.UH_static)
    prim.add_vertex(0)
    prim.add_vertex(1)
    prim.close_primitive()
    prim.add_vertex(1)
    prim.add_vertex(2)
    prim.add_vertex(3)
    prim.close_primitive()
    prim.add_vertex(3)
    prim.add_vertex(4)
    prim.add_vertex(5)
    prim.add_vertex(6)
    prim.close_primitive()

    adj = prim.make_adjacency()
    verts = adj.get_vertex_list()
    cut = adj.get_strip_cut_index()
    assert tuple(verts) == (
        0, 0, 1, 2,
        cut,
        0, 1, 2, 3, 4,
        cut,
        2, 3, 4, 5, 6, 6,
    )

    # Check that it decomposes properly to a lines-adjacency primitive
    prim = adj.decompose()
    assert isinstance(prim, core.GeomLinesAdjacency)
    verts = prim.get_vertex_list()
    assert tuple(verts) == (
        0, 0, 1, 2,

        0, 1, 2, 3,
        1, 2, 3, 4,

        2, 3, 4, 5,
        3, 4, 5, 6,
        4, 5, 6, 6,
    )


def test_geom_linestrips_offset_indexed():
    prim = core.GeomLinestrips(core.GeomEnums.UH_static)
    prim.add_vertex(0)
    prim.add_vertex(1)
    prim.close_primitive()
    prim.add_vertex(1)
    prim.add_vertex(2)
    prim.add_vertex(3)
    prim.close_primitive()
    prim.add_vertex(3)
    prim.add_vertex(4)
    prim.add_vertex(5)
    prim.add_vertex(6)
    prim.close_primitive()

    prim.offset_vertices(100)
    verts = prim.get_vertex_list()
    cut = prim.strip_cut_index
    assert tuple(verts) == (
        100, 101,
        cut,
        101, 102, 103,
        cut,
        103, 104, 105, 106,
    )

    prim.offset_vertices(-100)
    verts = prim.get_vertex_list()
    cut = prim.strip_cut_index
    assert tuple(verts) == (
        0, 1,
        cut,
        1, 2, 3,
        cut,
        3, 4, 5, 6,
    )

    prim.offset_vertices(100, 4, 9)
    verts = prim.get_vertex_list()
    cut = prim.strip_cut_index
    assert tuple(verts) == (
        0, 1,
        cut,
        1, 102, 103,
        cut,
        103, 104, 5, 6,
    )

    # Automatically upgrade to uint32
    prim.offset_vertices(100000)
    assert prim.index_type == core.GeomEnums.NT_uint32
    verts = prim.get_vertex_list()
    cut = prim.strip_cut_index
    assert tuple(verts) == (
        100000, 100001,
        cut,
        100001, 100102, 100103,
        cut,
        100103, 100104, 100005, 100006,
    )