demo-10

# filename: demo-10.m
# writer: won sunggyu
# date: 2025-04-22
# language: octave
# description: 삼각형 메시 그리기 (patch)

#------------------------------------------------------------------------------
# 초기화
#------------------------------------------------------------------------------

run("startup.m");
printf(fmt("{mfilename}\n", "#FF5733"));

#------------------------------------------------------------------------------
# 데이터 준비
#------------------------------------------------------------------------------
filename = "bunny.obj";
[vert, face] = load_obj(filename);

# vert
# -3.4102e-03   1.3032e-01   2.1754e-02
# -8.1719e-02   1.5250e-01   2.9656e-02
# -3.0543e-02   1.2478e-01   1.0983e-03
# -2.4902e-02   1.1211e-01   3.7560e-02
# -1.8406e-02   1.7843e-01  -2.4220e-02

# face
# 1069   1647   1578
# 1058    909    939
#  421   1176    238
# 1055   1101   1042
#  238   1059   1126

printf(fmt("Loaded {size(vert, 1)} vertices and {size(face, 1)} faces\n"));

#------------------------------------------------------------------------------
# 데이터 연산
#------------------------------------------------------------------------------



#------------------------------------------------------------------------------
# 그래프 그리기
#------------------------------------------------------------------------------

# 그래프
figured("Size", [960, 960], "Move", [-1280, 0], "Name", mfilename);
ax = subplots(1, 1);

# patch, trisurf, trimesh 함수는 모두 3D 메시를 그리는 함수입니다.

patch(ax, "Vertices", vert, "Faces", face, ...
    "FaceColor", [0.8 0.8 0.8], "EdgeColor", [0.5 0.5 0.5]);

# trisurf(face, vert(:,1), vert(:,2), vert(:,3), ...
#     "FaceColor", [0.8 0.8 0.8], "EdgeColor", [0.5 0.5 0.5]);

# trimesh(face, vert(:,1), vert(:,2), vert(:,3), ...
#     "FaceColor", [0.8 0.8 0.8], "EdgeColor", [0.5 0.5 0.5]);

for i = 1:60 * 10
    a = i * 360 / 60;
    set(ax, "View", [a, 30]);
    drawnow;
end