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Camera_follow.py
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Camera_follow.py
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# -*-coding:Utf-8 -*
# ===========================================================
# - HARFANG® 3D - www.harfang3d.com
# - Python tutorial -
# Camera follow
# ===========================================================
import harfang as hg
from math import radians, sqrt
from MathsSupp import *
# ==================================================================================================
# Camera follow
# ==================================================================================================
track_position = hg.Vector3(0, 4, -20)
track_orientation = hg.Matrix3(hg.Vector3(1, 0, 0), hg.Vector3(0, 1, 0), hg.Vector3(0, 0, 1))
pos_inertia = 0.2
rot_inertia = 0.07
follow_inertia = 0.01
follow_distance = 200
target_point = hg.Vector3(0, 0, 0)
target_matrix = hg.Matrix3()
target_node = None
satellite_camera = None
satellite_view_size = 100
satellite_view_size_inertia = 0.7
camera_move = hg.Vector3(0, 0, 0) # Translation in frame
noise_x = Temporal_Perlin_Noise(0.1446)
noise_y = Temporal_Perlin_Noise(0.1017)
noise_z = Temporal_Perlin_Noise(0.250314)
# ----------------------------------------
# Tracking views
# ----------------------------------------
back_view = {"position": hg.Vector3(0, 4, -20),
"orientation": hg.Matrix3(hg.Vector3(1, 0, 0), hg.Vector3(0, 1, 0), hg.Vector3(0, 0, 1)),
"pos_inertia": 0.2, "rot_inertia": 0.07}
front_view = {"position": hg.Vector3(0, 4, 40),
"orientation": hg.Matrix3(hg.Vector3(-1, 0, 0), hg.Vector3(0, 1, 0), hg.Vector3(0, 0, -1)),
"pos_inertia": 0.9, "rot_inertia": 0.05}
right_view = {"position": hg.Vector3(-40, 4, 0),
"orientation": hg.Matrix3(hg.Vector3(0, 0, -1), hg.Vector3(0, 1, 0), hg.Vector3(1, 0, 0)),
"pos_inertia": 0.9, "rot_inertia": 0.05}
left_view = {"position": hg.Vector3(40, 4, 0),
"orientation": hg.Matrix3(hg.Vector3(0, 0, 1), hg.Vector3(0, 1, 0), hg.Vector3(-1, 0, 0)),
"pos_inertia": 0.9, "rot_inertia": 0.05}
top_view = {"position": hg.Vector3(0, 50, 0),
"orientation": hg.Matrix3(hg.Vector3(1, 0, 0), hg.Vector3(0, 0, 1), hg.Vector3(0, -1, 0)),
"pos_inertia": 0.9, "rot_inertia": 0.05}
# =====================================================================================================
# Functions
# =====================================================================================================
def setup_camera_follow(targetNode: hg.Node, targetPoint: hg.Vector3, targetMatrix: hg.Matrix3):
global target_point, target_matrix, target_node
target_point = targetPoint
target_matrix = targetMatrix
target_node = targetNode
def RangeAdjust(value, oldmin, oldmax, newmin, newmax):
return (value - oldmin) / (oldmax - oldmin) * (newmax - newmin) + newmin
def update_target_point(dts):
global target_point, target_matrix
v = target_node.GetTransform().GetPosition() - target_point
target_point += v * pos_inertia * dts * 60
mat_n = target_node.GetTransform().GetWorld()
rz = hg.Cross(target_matrix.GetZ(), mat_n.GetZ())
ry = hg.Cross(target_matrix.GetY(), mat_n.GetY())
mr = rz + ry
if mr.Len() > 0.001:
target_matrix = MathsSupp.rotate_matrix(target_matrix, mr.Normalized(), mr.Len() * rot_inertia * dts * 60)
def update_track_translation(camera: hg.Node, dts):
global camera_move
trans = camera.GetTransform()
camera_pos = trans.GetPosition()
new_position = target_point + target_matrix.GetX() * track_position.x + target_matrix.GetY() * track_position.y + target_matrix.GetZ() * track_position.z
trans.SetPosition(new_position)
camera_move = new_position - camera_pos
return new_position
def update_follow_translation(camera: hg.Node, dts):
global camera_move
trans = camera.GetTransform()
camera_pos = trans.GetPosition()
aX = trans.GetWorld().GetX()
target_pos = target_node.GetTransform().GetPosition()
# Wall
v = target_pos - camera_pos
target_dir = v.Normalized()
target_dist = v.Len()
v_trans = target_dir * (target_dist - follow_distance) + aX * 20
new_position = camera_pos + v_trans * follow_inertia * 60 * dts
trans.SetPosition(new_position)
camera_move = new_position - camera_pos
return new_position
def update_track_direction(camera: hg.Node, dts, noise_level):
# v = target_point - camera.GetTransform().GetPosition()
f = radians(noise_level)
rot = target_matrix.ToEuler()
rot += hg.Vector3(noise_x.temporal_Perlin_noise(dts) * f, noise_y.temporal_Perlin_noise(dts) * f,
noise_z.temporal_Perlin_noise(dts) * f)
rot_mat = hg.Matrix3.FromEuler(rot)
rot_mat = rot_mat * track_orientation
camera.GetTransform().SetRotationMatrix(rot_mat)
return rot_mat # camera.GetTransform().GetWorld().GetRotationMatrix().LookAt(v, target_matrix.GetY()))
def update_follow_direction(camera: hg.Node):
v = target_point - camera.GetTransform().GetPosition()
rot_mat = camera.GetTransform().GetWorld().GetRotationMatrix().LookAt(v, hg.Vector3.Up)
camera.GetTransform().SetRotationMatrix(rot_mat)
return rot_mat
def update_camera_tracking(camera: hg.Node, dts, noise_level=0):
global target_point, target_node
update_target_point(dts)
rot_mat = update_track_direction(camera, dts, noise_level)
pos = update_track_translation(camera, dts)
mat = hg.Matrix4(rot_mat)
mat.SetTranslation(pos)
return mat
def update_camera_follow(camera: hg.Node, dts):
global target_point, target_node
update_target_point(dts)
rot_mat = update_follow_direction(camera)
pos = update_follow_translation(camera, dts)
mat = hg.Matrix4(rot_mat)
mat.SetTranslation(pos)
return mat
def set_track_view(parameters: dict):
global track_position, track_orientation, pos_inertia, rot_inertia
track_position = parameters["position"]
track_orientation = parameters["orientation"]
pos_inertia = parameters["pos_inertia"]
rot_inertia = parameters["rot_inertia"]
def setup_satellite_camera(camera: hg.Node):
camera.GetCamera().SetOrthographic(True)
camera.GetCamera().SetOrthographicSize(satellite_view_size)
camera.GetTransform().SetRotation(hg.Vector3(radians(90), 0, 0))
def update_satellite_camera(camera, screen_ratio, dts):
camera.GetTransform().SetPosition(
hg.Vector3(target_point.x, camera.GetCamera().GetOrthographicSize() * screen_ratio, target_point.z))
cam = camera.GetCamera()
size = cam.GetOrthographicSize()
cam.SetOrthographicSize(size + (satellite_view_size - size) * satellite_view_size_inertia)
def increment_satellite_view_size():
global satellite_view_size
satellite_view_size *= 1.01
def decrement_satellite_view_size():
global satellite_view_size
satellite_view_size = max(10, satellite_view_size / 1.01)