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Posted feedbacks - PostScript
PostScript で。 2次元なら簡単なんですが、3次元は手頃なライブラリが見当らないので力技で。 動画というわけにはいかないので、パラパラ漫画を出力します。 シェーダーを実装する元気はないので、立体感は強引な陰線処理と ステレオ図の出力で勘弁しといて下さい。 # どっかにレイトレースする PS のコードがあったような.... 前半分はひたすら行列計算用のコードです。 このままプリンタ出力すると 36枚で立方体がぐるっと一周まわります。 ghostscriptかAcrobat でページをすばやく切り替えて眺めてやると 回っているように見えるかなぁ.....
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 | %!PS
% Tiny Vector Library
/DotProduct { % [Vector1] [Vector2] DotProduct scaler
[ 3 1 roll
dup length 1 sub 0 1 3 -1 roll {
3 copy get 3 1 roll exch get mul 3 1 roll
} for
pop pop
]
0 exch
{ add } forall
} bind def
/VectorAdd { % [Vector1] [Vector2] VectorMul [NewVector]
[ 3 1 roll
dup length 1 sub 0 1 3 -1 roll {
3 copy get 3 1 roll exch get add 3 1 roll
} for
pop pop
]
} bind def
/VectorScale { % [Vector] scale VectorScale [Vector']
0 1 3 index length 1 sub {
2 index 1 index get
2 index mul
3 index 3 1 roll put
} for
pop
} bind def
/VectorCopy { % [Vector] VectorScale [NewVector]
aload length array astore
} bind def
% Tiny Matrix Library
/MatrixTranspose { % [Matrix1] MatrixTranspose [NewMatrix]
[ exch
dup 0 get length 1 sub 0 1 3 -1 roll
{
[ exch 2 index
{
1 index get
exch
} forall
pop ]
exch
} for
pop
]
} bind def
/MatrixMul { % [[Matrix1]] [[Matrix2]] MatrixMul [[NewMatrix]]
MatrixTranspose exch
[ 3 1 roll
{
[ exch 2 index
{
1 index DotProduct exch
} forall
pop
] exch
} forall
pop
]
} bind def
/MatrixCopy { % [[Matrix]] MatrixCopy [[NewMatrix]]
[ exch
{
VectorCopy
} forall
]
} bind def
/Matrix3Copy { % [[[Matrix]]] Matrix3Copy [[[NewMatrix]]]
[ exch
{
MatrixCopy
} forall
]
} bind def
/VectorZero { % [Vector] VectorZero [Vector']
0 1 2 index length 1 sub {
1 index exch 0 put
} for
} bind def
/VectorRoll { % [Vector] roll_count VectorRoll [Vector']
mark 2 index aload length counttomark 1 add index roll
counttomark 2 add index astore pop pop pop
} bind def
/MatrixIdentity { % size MatrixIdentity [[NewMatrix]]
[ exch dup array VectorZero dup 0 1 put
% [ size [1 0 ... 0]
exch {
dup VectorCopy 1 VectorRoll
} repeat
pop
]
} bind def
% End of Matrix Library
% --------------------------------------
/VY { [ exch ] MatrixTranspose } bind def
/VX { MatrixTranspose 0 get } bind def
/RotateMatrixX { % theta(degree) RotateMatrixX [Matrix]
dup cos exch sin 2 copy neg % cos sin cos -sin
[
[ 1 0 0]
[ 0 6 -2 roll ]
[ 0 7 -2 roll exch ]
]
} bind def
/RotateMatrixY { % theta(degree) RotateMatrixY [Matrix]
dup cos exch sin 2 copy neg % cos sin cos -sin
[
[ 6 -1 roll 0 7 -1 roll ]
[ 0 1 0 ]
[ 5 -1 roll 0 7 -1 roll ]
]
} bind def
/RotateMatrixZ { % theta(degree) RotateMatrixZ [Matrix]
dup cos exch sin 2 copy neg % cos sin cos -sin
[
[ 4 -2 roll 0 ]
[ 5 -2 roll exch 0 ]
[ 0 0 1 ]
]
} bind def
/CompareDistance { % [x1 y1 z1] [x2 y2 z2] CompareDistance [] [] z1-z2
dup 0 get 2 get 3 -1 roll dup 0 get 2 get
% [V2] z2 [V1] z1
exch 4 1 roll sub
} bind def
/Sort { % [[x y] [x1 y1] Array Data ] {CompareFunction} Sort [ArrayData]
cvx [ 3 -1 roll
aload length
% func -mark[- [] [] [] [] [] len
-1 2 { % func -mark[- [] [] [] [] [] len2
-1 2 {
3 1 roll
counttomark 1 add index exec %% Compare
0 lt { exch } if
3 -1 roll
1 roll
} for
counttomark 1 roll
} for
counttomark 1 roll
] exch pop
} bind def
/CalcVertex { % [Vect] distance scale CalcVertex x y
3 -1 roll aload pop
% distance scale x y z
5 -2 roll exch
% x y z scale distance
dup 0 eq {
pop exch pop
} {
3 -1 roll add div
} ifelse
% x y scale
dup 3 -1 roll mul
% x scale scale*y
3 1 roll mul exch
} bind def
/DrawPolygon { % [[GC] [Vertex1] [Vertex2] ...] distance scale
3 -1 roll mark exch aload pop
counttomark 2 add index counttomark 1 add index CalcVertex
moveto
counttomark 1 sub {
counttomark 2 add index counttomark 1 add index CalcVertex
lineto
} repeat
closepath
gsave 0.5 setgray fill grestore
0.1 setlinewidth stroke
pop pop pop pop
} bind def
/Projection {
% distance scale [[Object]] view_matrix Projection
% distance scale [[Object]] view_matrix
4 1 roll dup Matrix3Copy dup {
% vmt dist scale [[Obj]] [[NewObj]] [[Polygon-n]]
{
% vmt dist scale [[Obj]] [[NewObj]] [[Vertex-n]]
dup 6 index exch VY MatrixMul VX
0 exch putinterval
} forall
} forall
/CompareDistance Sort
% vmt dist scale [[Obj]] [[NewObj']]
{
% vmt dist scale [[Obj]] [[NewPolygon-n]]
3 index 3 index DrawPolygon
} forall
4 -1 roll
} bind def
/Translate { % [[[Object]]] [dx dy dz] Translate [[[Object']]]
1 index {
% [[[Object]]] [dx dy dz] [[Polygon]]
{
% [[[Object]]] [dx dy dz] [x y z]
dup 2 index VectorAdd
% [[[Object]]] [dx dy dz] [x y z] [nx ny nz]
0 exch putinterval
} forall
} forall
pop
} bind def
% ---------------- Test Code -------------------
/Cube [
% Gravity Center, Vertex1, 2, ....
[[0.5 0.5 0] [0 0 0] [1 0 0] [1 1 0] [0 1 0]]
[[0.5 0.5 1] [0 0 1] [1 0 1] [1 1 1] [0 1 1]]
[[0 0.5 0.5] [0 0 0] [0 1 0] [0 1 1] [0 0 1]]
[[1 0.5 0.5] [1 0 0] [1 1 0] [1 1 1] [1 0 1]]
[[0.5 0 0.5] [0 0 0] [0 0 1] [1 0 1] [1 0 0]]
[[0.5 1 0.5] [0 1 0] [0 1 1] [1 1 1] [1 1 0]]
] def
/Demo {
% Projection Distance & Scale
5 400
% Object
Cube [-0.5 -0.5 -0.5] Translate
% Initial View Matrix
3 MatrixIdentity
-20 RotateMatrixX MatrixMul
20 RotateMatrixY MatrixMul
5 RotateMatrixZ MatrixMul
% Rotation
36 {
gsave
200 200 translate
1 1 scale
0.1 setlinewidth
Projection
%---- Stereo Projection ----
200 0 translate
5 RotateMatrixY MatrixMul
Projection
-5 RotateMatrixY MatrixMul
%---- End Stereo Projection ----
grestore
showpage
10 RotateMatrixY MatrixMul
} repeat
4 { pop } repeat
} bind def
Demo
|


ところてん
#5940()
Rating0/4=0.00
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