Differences

This shows you the differences between two versions of the page.

--- texture_index [2013/05/03 14:47] – created alancoelho
+++ texture_index [2022/11/03 15:08] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Texture Index from Spherical Harmonics Parameters - Version 5 ======
+	macro Texture_Index(sh, t)
+    {
+      prm = {
+         fn f(c) {
+            def s = Concat(sh,"_",c);
+            return If(Prm_There(s), s^2,0);
+         }
+         return 1
+         +1/5  (f(c20)+f(c21p)+f(c21m)+f(c22p)+f(c22m))
+         +1/9  (f(c40)+f(c41p)+f(c41m)+f(c42p)+f(c42m)+f(c43p)+f(c43m)+f(c44p)+f(c44m))
+         +1/13 (f(c60)+f(c61p)+f(c61m)+f(c62p)+f(c62m)+f(c63p)+f(c63m)+f(c64p)+f(c64m)+f(c65p)+f(c65m)+f(c66p)+f(c66m))
+         +1/17 (f(c80)+f(c81p)+f(c81m)+f(c82p)+f(c82m)+f(c83p)+f(c83m)+f(c84p)+f(c84m)+f(c85p)+f(c85m)+f(c86p)+f(c86m)+f(c87p)+f(c87m)+f(c88p)+f(c88m));
+      } : t
+   }
+==== Usage ====
+   str…
+      PO_Spherical_Harmonics(sh, 8)
+      Texture_Index(sh, 0)
+On termination of refinement the second argument of the Texture_Index macro is updated.