projection s
Projects a 3D coordinate in a 2D system. Plane attribute allows to select which coordinate to project (the remaining coordinate corresponds to the eye coordinate). S-rate Scale and eye are interpolated.
Inlets
frac32buffer input x coordinate
frac32buffer input x coordinate
frac32buffer input x coordinate
frac32 mod input for the scale parameter (bitshifted left by 4 bits)
frac32 mod input for the eye parameter
Outlets
frac32buffer projected x
frac32buffer projected y
Parameters
frac32.s.map coordinate of the eye along the camera axis
frac32.u.map scaling of the projected coordinate
Attributes
combo plane of projection
int32_t calc_Px(int32_t x, int32_t y, int32_t z, int32_t scale, int32_t eye) {
float num;
float den;
#if (attr_plane == 1) // plane xy, depth z
{
num = x;
den = (eye)-z;
}
#elif (attr_plane == 2) // plane yz, depth x
{
num = y;
den = (eye)-x;
}
#elif (attr_plane == 3) // plane zx, depth y
{
num = z;
den = (eye)-y;
}
#endif
return (int32_t)scale * num / den;
}
int32_t calc_Py(int32_t x, int32_t y, int32_t z, int32_t scale, int32_t eye) {
float num;
float den;
#if (attr_plane == 1) // plane xy, depth z
{
num = y;
den = (eye)-z;
}
#elif (attr_plane == 2) // plane yz, depth x
{
num = z;
den = (eye)-x;
}
#elif (attr_plane == 3) // plane zx, depth y
{
num = x;
den = (eye)-y;
}
#endif
return ((int32_t)scale * num / den);
}
int32_t eye = 0;
int32_t scale = 0;int32_t eye_increment = param_eye + inlet_eye - eye >> 4;
int32_t scale_increment = param_scale + (inlet_scale)-scale >> 4;
for (int i = 0; i < BUFSIZE; i++) {
outlet_Px[i] = calc_Px(inlet_x[i], inlet_y[i], inlet_z[i], scale, eye);
outlet_Py[i] = calc_Py(inlet_x[i], inlet_y[i], inlet_z[i], scale, eye);
eye += eye_increment;
scale += scale_increment;
}