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        <title>Yz-Learning Base Wiki - game-engineer:classes:2025:gamemath2</title>
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        <item>
            <title>解答例 - 作成</title>
            <link>https://www.yz-learning.com/doku.php?id=game-engineer:classes:2025:gamemath2:02&amp;rev=1780322610</link>
            <description>解答例

----------

問題1

\[
T = \begin{bmatrix} 1 &amp; 0 &amp; 0 \\ 0 &amp; 1 &amp; 0 \\ 4 &amp; -1 &amp; 1 \end{bmatrix}
\]

答え：

\[
(6, 2)
\]

----------

問題2

\[
S = \begin{bmatrix} 3 &amp; 0 &amp; 0 \\ 0 &amp; 2 &amp; 0 \\ 0 &amp; 0 &amp; 1 \end{bmatrix}
\]

答え：

\[
(6, 6)
\]

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問題3

\[
R = \begin{bmatrix} 0 &amp; 1 &amp; 0 \\ -1 &amp; 0 &amp; 0 \\ 0 &amp; 0 &amp; 1 \end{bmatrix}
\]

答え：

\[
(0, 1)
\]

----------

問題4

\[
S = \begin{bmatrix} 2 &amp; 0 &amp; 0 \\ 0 &amp; 3 &amp; 0 \\ 0 &amp; 0 &amp; 1 \end{bmatrix}
\]

\[
T = \begin{bmatrix} 1 &amp; 0 &amp; 0 \\ 0 &amp; 1 &amp; 0 \\ 5 &amp; -1 &amp; 1 …</description>
            <author>root@undisclosed.example.com (root)</author>
            <pubDate>Mon, 01 Jun 2026 14:03:30 +0000</pubDate>
        </item>
        <item>
            <title>同次変換・アフィン変換 練習問題</title>
            <link>https://www.yz-learning.com/doku.php?id=game-engineer:classes:2025:gamemath2:01&amp;rev=1779165353</link>
            <description>同次変換・アフィン変換 練習問題

2D・3D / DirectX11形式

----------

導入：右から掛けるルールと左から掛けるルール

3Dグラフィックスの行列計算では、資料やライブラリによって点と行列の掛け方\[
P&#039; = M P
\]\[
P&#039; = P M
\]\(P(x, y)\)\[
P = \begin{bmatrix} x \\ y \\ 1 \end{bmatrix}
\]\[
P&#039; = M P
\]\(t_x\)\(t_y\)\[
T = \begin{bmatrix} 1 &amp; 0 &amp; t_x \\ 0 &amp; 1 &amp; t_y \\ 0 &amp; 0 &amp; 1 \end{bmatrix}
\]\[
P&#039; = T P
\]\[
\begin{bmatrix} x&#039; \\ y&#039; \\ 1 \end{bmatrix} = \begin{bmatrix} 1 &amp; 0 &amp; t_x \\ 0 &amp; 1 &amp; t_y \\ 0 &amp; 0 &amp; 1 \end{bmatrix} \begin{bmatrix} x \\ y \\ 1 \end{bmatrix}
\]\[
x&#039; = 1 \tim…</description>
            <author>root@undisclosed.example.com (root)</author>
            <pubDate>Tue, 19 May 2026 04:35:53 +0000</pubDate>
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