christoph/python-objrender
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add comments + split the transformations

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Christoph Urlacher
2026-02-12 20:52:39 +01:00
parent 1c4498653e
commit ff07f7052f
1 changed files with 12 additions and 3 deletions
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15
main.py
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@ -31,6 +31,8 @@ IndexedFaceSet = list[IndexedFace]
def to_viewport(verts: Vertex2Set) -> Vertex2Set:
"""Maps vertices into the [0, WIDTH]x[0, HEIGHT] viewport"""
def transform(vert: Vertex2) -> Vertex2:
return (
((vert[0] + 1.0) / 2.0) * CANVAS_SIZE,
@ -41,6 +43,8 @@ def to_viewport(verts: Vertex2Set) -> Vertex2Set:
def to_imageplane(verts: Vertex3Set) -> Vertex2Set:
"""Projects vertices onto the [-1, 1]x[-1, 1] imageplane"""
def transform(vert: Vertex3) -> Vertex2:
return (vert[0] / vert[2], vert[1] / vert[2])
@ -48,6 +52,8 @@ def to_imageplane(verts: Vertex3Set) -> Vertex2Set:
def translate(verts: Vertex3Set, distance: float) -> Vertex3Set:
"""Translates vertices along the forward-axis in 3D space"""
def transform(vert: Vertex3) -> Vertex3:
return (vert[0], vert[1], vert[2] + distance)
@ -55,6 +61,8 @@ def translate(verts: Vertex3Set, distance: float) -> Vertex3Set:
def rotate(verts: Vertex3Set, angle: float) -> Vertex3Set:
"""Rotates vertices around the up-axis in 3D space"""
def transform(vert: Vertex3) -> Vertex3:
return (
vert[0] * cos(angle) - vert[2] * sin(angle),
@ -86,9 +94,10 @@ def draw(drawlist, vertices: Vertex3Set, faces: IndexedFaceSet, time: float):
thickness=EDGE_SIZE,
)
viewport_vertices: Vertex2Set = to_viewport(
to_imageplane(translate(rotate(vertices, time), CAMERA_DISTANCE))
)
rotated_vertices: Vertex3Set = rotate(vertices, time)
translated_vertices: Vertex3Set = translate(rotated_vertices, CAMERA_DISTANCE)
imageplane_vertices: Vertex2Set = to_imageplane(translated_vertices)
viewport_vertices: Vertex2Set = to_viewport(imageplane_vertices)
if RENDER_VERTICES:
for v in viewport_vertices: