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Update Errata.md

Error in VirtualPos equation required for exercise 7.2.

NOTE: I'm using the ebook version which seems like it might have different pagination to the version of the book used by Takashi
Josh1603 4 年之前
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Errata.md

@@ -20,6 +20,10 @@ please create an issue on this GitHub repository.
 * Chapter 6
   - Page 199: The reference to "horizontal" field of view should say "vertical" field of view, since it
     affects the y-component (found by Takashi Imagire)
+ * Chapter 7
+  - Page 386: The virtual position of sound equation yields a vector rather than a position (The virtual position
+    of the sound is obtained by adding the camera position to that vector). This equation is required for Ex 7.2
+    (found by Joshua Hardman)
 * Chapter 13
   - Page 396: In the equations for bilinear interpolation, the vFactor component should access the .v
-    components of P, A, and C, not the .u components (found by Takashi Imagire)
+    components of P, A, and C, not the .u components (found by Takashi Imagire)