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環境マッピング
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康弘 等々力
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環境マッピング( Environment mapping )の手法について
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環境マッピング
1.
Emviroment Mapping Yasuhiro Todoroki
2.
環境マッピング • 周りの環境 (
景色 ) などが、描画物体に影 響する際、それ ( 影響 ) を反映するための 技術。
3.
実装方法 OVERVIEW 1.周りの環境を六方向からキャプチャする 2.仮想のキューブを用意し、そのキャプチャした画像を各々の場所に六面に貼り 付ける。 3.視線と法線から反射ベクトルを求める。 4. 6
面のいずれかの面が、反射ベクトルとぶつかる。そのぶつかった面と、反射 面と、 R との交点 ベクトルとの交点にある情報 ( 色 ) を物体の色とする。 (Table 参照 ) N 周りの環境を、 六方向からキャプチャ V R V 視線ベクトル N 法線ベクトル R 反射ベクトル
4.
変数の名称の解説 a(x 軸 ) (u,
v) N R b(y 軸 ) P(x,y,z) V V 視線ベクトル c(z 軸 ) N 法線ベクトル R 反射ベクトル P レンダリングポイント a,b,c 仮想キューブの大きさ
5.
Cube の座標定義 +z Top +x +y
Left -z +y Back +x -z Botto m +x -y Front +x +y Right +z
6.
描画手順 1 .多角形を内挿補間(上記頂点データ)する。 2 .多角形内部の内挿点
P(x, y, z) の面法線 N と V を得る。 3 . N, V から視線反射ベクトル R を計算する 4 . R=2N(NV)-V から Rx,Ry, Rz を求める ここで( NV) は N と V の内積を示す 5 . Table1,Table2 より、 Rx, Ry, Rz から6面キューブの内の交差面と、 その面上の交差点( u, v) を決定する。 ( 以下がその手法 ) -5.1 Rx, Ry, Rz の符号から rx, ry, rz の中間値を求める。 (Table1 参 照) -5.2 Table2 から、交差する可能性のある面( R の符号から判断)の 式に、 Table1 より求めた、 rx, ry, rz 及び仮想キューブの大きさである a,b,c を入れ有効値を調べる。 表の Face は下記に対応する。 +x: 右側面 -x: 左側面 +y: 上面 -y: 底面 +z: 前面 -z: 後面
7.
Table I Reflection vector
scale formulations for intersection point R component sign RX>0 Scale factor rX=(a-x)/RX RX<0 rX=-x/RX RY>0 rY=(b-y)/RY RY<0 rY=-y/RY RZ>0 rZ=(c-z)/RZ RZ<0 rZ=-z/RZ
8.
Table II Formulations for
per-face texture coordinate Face +x u (z+rXRZ)/c v (y+rXRY)/b -x (c-z-rXRZ)/c (y+rXRY)/b +y (x+rYRX)/a (z+rYRZ)/c -y (x+rYRX)/a (c-z-rYRZ)/c +z (a-x-rZRX)/a (y+rZRY)/b -z (x+rZRX)/a (y+rZRY)/b この中から、最もらしいのは一つしかでない。 (u,v が二つともマイナスにならないもの それが、 u,v アドレスとなる。
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