def move_along_view(self, camera, distance):
px, py, pz = gh_camera.get_position(camera._id)
vx, vy, vz = gh_camera.get_view_vector(camera._id)
px = px + (vx * distance)
py = py + (vy * distance)
pz = pz + (vz * distance)
gh_camera.set_position(camera._id, px, py, pz)
def ComputeProjectiveScaleFactor(self, camera, lookat_x, lookat_y,
lookat_z, screen_height, fov):
fov_rad = fov * math.pi / 180.0
focalLength = (0.5 * screen_height) / (math.tan(fov_rad / 2))
px, py, pz = gh_camera.get_position(camera._id)
dx = lookat_x - px
dy = lookat_y - py
dz = lookat_z - pz
pivotDistance = math.sqrt((dx * dx) + (dy * dy) + (dz * dz))
S = pivotDistance / focalLength
return S
def strafe_h_xz(self, camera, dist, update_lookat):
v = vec3()
u = vec3()
v.x, v.y, v.z = gh_camera.get_view_vector(camera._id)
v.neg()
u.x, u.y, u.z = gh_camera.get_up_vector(camera._id)
xvec = v.cross(u)
p = vec3()
p.x, p.y, p.z = gh_camera.get_position(camera._id)
p.x = p.x + (xvec.x * dist)
p.z = p.z + (xvec.z * dist)
gh_camera.set_position(camera._id, p.x, p.y, p.z)
if (update_lookat == 1):
lookat_x = camera._lookat_x + (xvec.x * dist)
lookat_y = camera._lookat_y + (xvec.y * dist)
lookat_z = camera._lookat_z + (xvec.z * dist)
self.set_orbit_lookat(camera, lookat_x, lookat_y, lookat_z)