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POincrementing my spherical coordinates clockwise
 

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  1. POincrementing my spherical coordinates clockwise
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    <p>I am launching a projectile around a sphere. My code moves it in a counterclockwise direction just fine. However, I would like it to move in a clockwise direction instead.</p> <p>I'm guessing that it's a matter of tuning my math.</p> <pre><code>// these are my stepping and incrementing variables int goose1_egg1_step = 1; int &amp;r_goose1_egg1_step = goose1_egg1_step; float goose1_egg1_divider = 17500; // the starting theta/phi values are: 5 and 5 int goose1_egg1_theta=5; int goose1_egg1_phi=5; // the ending theta/phi values are: 7 and 1 // there is a difference of 2 between the start and end theta values // there is a difference of 4 between the start and end phi values float goose1_egg1_theta_increment = 2/goose1_egg1_divider; float goose1_egg1_phi_increment = 4/goose1_egg1_divider; </code></pre> <p>This is my function that displays the updated coordinates each frame with a sphere:</p> <pre><code>if (goose1_egg1_step &lt; goose1_egg1_divider) { float goose1_egg1_theta_math = (goose1_egg1_theta+(goose1_egg1_theta_increment* r_goose1_egg1_step))/10.0*M_PI; float goose1_egg1_phi_math = (goose1_egg1_phi-(goose1_egg1_phi_increment* r_goose1_egg1_step))/10.0*2*M_PI; r_goose1_egg1_x = Radius * sin(goose1_egg1_theta_math) * cos(goose1_egg1_phi_math); r_goose1_egg1_y = Radius * sin(goose1_egg1_theta_math) * sin(goose1_egg1_phi_math); r_goose1_egg1_z = Radius * cos(goose1_egg1_theta_math); glPushMatrix(); glTranslatef(r_goose1_egg1_x,r_goose1_egg1_y,r_goose1_egg1_z); glColor3f (1.0, 0.0, 0.0); glutSolidSphere (0.075,5,5); glEnd(); glPopMatrix(); } </code></pre> <p>And here is how I increment the step value:</p> <pre><code>if (r_goose1_egg1_step &lt; goose1_egg1_divider) { ++(r_goose1_egg1_step); } else r_goose1_egg1_step=1; </code></pre>
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    1. USgenpfault
    1. USkropcke
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      1. POincrementing my spherical coordinates clockwise
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    2. VO
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      1. VTUpMod
    1. COIf you think it's a matter of tuning your math, you should probably try that first.
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      1. POincrementing my spherical coordinates clockwise
      1. USanthropomorphic
    2. CO+1 (offsetting) Don't understand the downvote. Looks like a perfectly legitimate question to me. Opposing viewpoints welcome.
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      1. POincrementing my spherical coordinates clockwise
      1. USBob Kaufman
 

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