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--- public:t-gede-14-1:lab3 [2014/01/11 17:08] – [When You Are Finished] marino
+++ public:t-gede-14-1:lab3 [2024/04/29 13:33] (current) – external edit 127.0.0.1
@@ Line 3: / Line 3: @@
 This lab is to some extent based on Chapter 4 in the textbook, in particular sections 4.2.1 "Points and Cartesian Coordinates" and 4.2.4 "Vector Operations".
-The main focus here is to learn how we can use other coordinate systems to help us generate effects or behaviour that would be unintuitive to get with Cartesian coordinates.
+The main focus here is to learn how we can use other coordinate systems to help us generate effects or behaviour that would be unintuitive to do with Cartesian coordinates.
 ===== Discussion =====
-Discussion thread for this lab is here: [[https://piazza.com/class/hq7dlipqggr2qe?cid=8|Lab 2 Discussion Thread]]
+Discussion thread for this lab is here: [[https://piazza.com/class/hq7dlipqggr2qe?cid=8|Lab 3 Discussion Thread]]
 ===== Goal ======
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 <box green 100% | **Bonus Pts!** >
   - **Activate Only when Facing Ogre** To know if an object is in front of the camera, you can apply a simple dot product test. Take the vector between the camera and the object (use vector subtraction) and call that **V**. Now take the dot product between **V** and the facing vector **F** of the camera (''Ogre::Vector3 F = _Cam->getDirection();''). If this dot product is greater than 0, you know the object is in front of the camera. Finally, why don't you also check to see if the object is relatively close to the camera (you can use the Ogre::Vector3::length() method). Now you can add this to your project such that the special effect only gets updated when these two checks are passed! :-)
-  - Make the cube an object that is lying on the ground, when the Ogre passes over the cube, he will pick it up and the animation will play the cube circling the Ogre like he just picked up a power-up. \\ Wouldn't it be would be fun to implement it with a random number of randomly placed cubes around the plane that the Ogre has to collect? 8-)
+  - **Make the cube an object that is lying on the ground**, when the Ogre passes over the cube, he will pick it up and the animation will play the cube circling the Ogre like he just picked up a power-up. \\ Wouldn't it be would be fun to implement it with a random number of randomly placed cubes around the plane that the Ogre has to collect? 8-)
-  - Finally, there is only a small step to making the cylindrical effect a Spherical effect:<code>Lets remove the height, and replace it with the angle theta Θ
+  - **Finally, there is only a small step to making the cylindrical effect a Spherical effect:**<code>Lets remove the height, and replace it with the angle theta Θ
 So the coordinate would be like (angle,radius,angle) = (Θ,r,α)
 X coordinate = sin(α) times cos(Θ) times r
-Y coordinate = cos(Θ) times r
+Y coordinate = cos(α) times r  // This was Cos of Θ, which was wrong :(
 Z coordinate = sin(α) sin(Θ) times r
 </code> And find some interesting way to make the spherical movement random :-)
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 {{ :public:t-gede-14-1:gede_lab3_final_example.png?nolink |}}
-Upload your **commented source files** into Lab2 in MySchool (zip them up if more than one). The lab projects will not be graded, but their completion counts towards your participation grade.
+Upload your **commented source files** into Lab3 in MySchool (zip them up if more than one).