Materials (Metroid Prime): Difference between revisions

Materials (Metroid Prime) (view source)

248 bytes added , 5 February 2015

Anonymous user

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 This mode rotates the texture. It has two float parameters: ''offset'' and ''scale''.
-<pre>angle = (s * scale) + offset;</pre>
+<pre>float angle = (s * scale) + offset;
+float acos = cos(angle);
+float asin = sin(angle);
+float translateX = (1.0 - (acos - asin)) * 0.5;
+float translateY = (1.0 - (asin + acos)) * 0.5;</pre>
-The texture is then rotated by ''angle'' degrees.
+The resulting texture matrix is laid out as:
+<pre>acos, -asin, 0.0, translateX,
+asin,  acos, 0.0, translateY,
+.0,   0.0, 1.0,        0.0</pre>
 ==== Mode 4/5: U/V Offset ====