我正在发射一个球体周围的抛射物。我的代码以逆时针方向移动它就好了。不过,我希望它以顺时针方向移动。顺时针递增我的球坐标
我猜这是一个调整我的数学问题。
// these are my stepping and incrementing variables
int goose1_egg1_step = 1;
int &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;
这是我的功能,显示更新后的坐标与球体每一帧:
if (goose1_egg1_step < 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();
}
这里是我如何递增步进值:
if (r_goose1_egg1_step < goose1_egg1_divider)
{
++(r_goose1_egg1_step);
}
else
r_goose1_egg1_step=1;
如果您认为这是一个调整数学的问题,那么您应该先尝试一下。 – anthropomorphic 2012-07-10 00:04:27
+1(抵消)不明白downvote。看起来对我来说是一个完全合法的问题。反对的观点值得欢迎。 – 2012-07-10 13:51:06