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camera.py
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camera.py
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"""
camera.py -- A camera for Panda3D that can be rotated or moved around by
setting values in a control map.
Copyright (c) 2007 Sean Hammond [email protected]
This file is part of PandaSteer.
PandaSteer is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
PandaSteer is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PandaSteer; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""
# TODO: add a camera with a state (FSM) and controls for switching between
# states, where each state is a camera mode (floating camera,
# following camera, etc
from direct.task import Task
from direct.showbase.DirectObject import DirectObject
import pandac.PandaModules as P
from direct.showbase.PythonUtil import clampScalar
from direct.interval import LerpInterval as LERP
CameraM = P.BitMask32.bit(3)#What shouldn't be between camera and avatar.
def fromCol(parent,handler,type,mask = P.BitMask32.allOn()):
"""Setup a from collision solid.
Last I checked CollisionPolygon 's and CollisionTube 's can't be used
as from solids. If you pass one, it won't hit anything"""
nodepath = parent.attachNewNode(P.CollisionNode('frmcol'))
nodepath.node().addSolid(type)#add the solid to the new collisionNode
nodepath.node().setFromCollideMask(mask)#allow selective masking
nodepath.setCollideMask(P.BitMask32.allOff())#it's a from solid only.
####uncomment this line to make the collision solid visible:
##nodepath.show()
base.cTrav.addCollider(nodepath,handler)#add to the traverser
try:#the next line doesn't work on queues. (not necessary)
handler.addCollider(nodepath,parent)#keep the ward out of trouble
except:
pass#Don't care. This method needs to work on queues too.
return nodepath#we might need the new CollisionNode again later.
class Camera:
"""A camera with that can be rotated and moved around by setting values in
a control map.
"""
def __init__(self,pos):
"""Initialise the camera. Pos should be a Point3, the initial position
of the camera."""
self.prevtime = 0
# The camera's controls:
# 0 = off, 1 = on
self.controlMap = {"left":0, "right":0, "up":0, "down":0, "forward":0,
"backward":0, "strafe-left":0, "strafe-right":0}
# Task that moves the camera according to the control map.
taskMgr.add(self.move,"cameraMoveTask")
base.disableMouse()
base.camera.setPos(pos)
def lookAt(self,point):
"""Wrapper method for base.camera.lookAt"""
base.camera.lookAt(point)
def lookAt(self,x,y,z):
"""Wrapper method for base.camera.lookAt"""
base.camera.lookAt(x,y,z)
def move(self,task):
"""Update the camera's position before rendering the next frame.
This is a task function and is called each frame by Panda3D.
Arguments:
task -- A direct.task.Task object passed to this function by Panda3D.
Return:
Task.cont -- To tell Panda3D to call this task function again next
frame.
"""
elapsed = task.time - self.prevtime
# Rotate the camera according to which of it's controls are activated.
speed = 60
if (self.controlMap["left"]!=0):
base.camera.setH(base.camera.getH() + (elapsed*speed))
if (self.controlMap["right"]!=0):
base.camera.setH(base.camera.getH() - (elapsed*speed))
if (self.controlMap["up"]!=0):
base.camera.setP(base.camera.getP() - (elapsed*speed))
if (self.controlMap["down"]!=0):
base.camera.setP(base.camera.getP() + (elapsed*speed))
if (self.controlMap["forward"]!=0 or self.controlMap["backward"]!=0):
# This two-line Matrix trick is taken from the Roaming Ralph demo
# that comes with Panda3D, see
# <http://panda3d.org/phpbb2/viewtopic.php?t=1446> for an
# explanation.
forward = base.camera.getNetTransform().getMat().getRow3(1)
forward.normalize()
if (self.controlMap["forward"]!=0):
base.camera.setPos(base.camera.getPos() + forward*(elapsed*speed))
if (self.controlMap["backward"]!=0):
base.camera.setPos(base.camera.getPos() - forward*(elapsed*speed))
if (self.controlMap["strafe-left"]!=0 or self.controlMap["strafe-right"]!=0):
# Compute the camera's right direction in the same way we compute
# the forward direction above, using the NodePath's transformation
# matrix.
right = base.camera.getNetTransform().getMat().getRow3(0)
right.setZ(0)
right.normalize()
if (self.controlMap["strafe-left"]!=0):
base.camera.setPos(base.camera.getPos() - right*(elapsed*speed))
if (self.controlMap["strafe-right"]!=0):
base.camera.setPos(base.camera.getPos() + right*(elapsed*speed))
# Store the task time and continue.
self.prevtime = task.time
return Task.cont
def setControl(self, control, value):
"""Set the state of one of the camera's movement controls.
Arguments:
See self.controlMap in __init__.
control -- The control to be set, must be a string matching one of
the strings in self.controlMap.
value -- The value to set the control to.
"""
self.controlMap[control] = value
class EdgeScreenTracker(DirectObject):
"""Mouse camera control interface."""
def __init__(self,avatar,offset=P.Point3.zero(), dist=10,
rot=20,zoom=(30,400),pitch=(-15,0)):
# Disable default camera interface.
base.disableMouse()
# Set parameters
self.zoomLvl = dist #camera starting distance
self.speed = 1.0/rot # Controls speed of camera rotation.
self.zoomClamp=zoom#clamp zoom in this range
self.clampP=pitch#clamp pitch in this range
self.target = avatar.attachNewNode('camera target')
self.target.setPos(offset)#offset target from avatar.
#Load the camera
self.__loadCamera()
#Enable new camera interface
self.accept('arrow_up', self.cameraZoom,[0.7])#Translated. For zooming.
self.accept('arrow_down', self.cameraZoom,[1.3])
self.accept('arrow_left', self.rotateCam,[P.Point2(-10,0)])
self.accept('arrow_right', self.rotateCam,[P.Point2(10,0)])
taskMgr.add(self.mousecamTask, "mousecamTask")#For edge screen tracking
def __loadCamera(self):
"""Only seperate for organisation, treat it as is part of __init__() .
Load the camera & setup segmet & queue for detecting obstructions."""
#Don't rotate the target with the avatar.
self.target.node().setEffect(P.CompassEffect.make(render))
camera.reparentTo(self.target)# Attach the camera to target.
camera.setPos(0,-self.zoomLvl,50)# Position the camera
self.rotateCam(P.Point2(0,0))# Initialize gimbal clamps.
self.Q = P.CollisionHandlerQueue()# New queue for camera.
self.segment = fromCol(self.target,self.Q,
P.CollisionSegment(P.Point3.zero(),camera.getPos(self.target)),
P.BitMask32(CameraM))#CameraM into segment between camera & target.
def mousecamTask(self,task):
"""Rotate camera when the pointer moves to the edges of the screen.
Also temporarily zooms in past an obstructing CameraM'ed object."""
self.setDist(self.zoomLvl)#preset dist to current zoom level.
if self.Q.getNumEntries() > 0:#if there was a collision
self.Q.sortEntries() #so we get the closest collision to avatar
point=self.Q.getEntry(0).getSurfacePoint(self.target)#get the point
if point.lengthSquared()<camera.getPos().lengthSquared():#not out.
self.setDist(point.length())#Temporarily zoom to point.
camera.lookAt(self.target)# always point camera at target
if not base.mouseWatcherNode.hasMouse():#See if the mouse is available.
return Task.cont#if no, just loop again.
# Get the relative mouse position, its always between 1 and -1
mpos = base.mouseWatcherNode.getMouse()
if mpos.getX() > 0.99:
self.rotateCam(P.Point2(-10,0))
elif mpos.getX() < -0.99:
self.rotateCam(P.Point2(10,0))
if mpos.getY() > 0.9:
self.rotateCam(P.Point2(0,-3))
elif mpos.getY() < -0.9:
self.rotateCam(P.Point2(0,3))
return Task.cont#loop again.
def rotateCam(self,arc):
"""Setup a lerp interval to rotate the camera about the target."""
newP=clampScalar(self.target.getP()-arc.getY(),*self.clampP)#Clamped.
newH=self.target.getH()+arc.getX()#Not clamped, just added.
LERP.LerpHprInterval(self.target, self.speed,#Setup the interval\
P.Vec3(newH,newP,self.target.getR(), ), ).start()#and start it.
def cameraZoom(self,zoomFactor,):
"""Scale and clamp zoom level, then set distance by it."""
self.zoomLvl=clampScalar(self.zoomLvl*zoomFactor,*self.zoomClamp)
self.setDist(self.zoomLvl)
def setDist(self,newDist):
"""Set camera distance from the target."""
vec = camera.getPos()
vec.normalize()#set length to 1
vec*=newDist#set length to clamped value
camera.setFluidPos(vec)#move the camera to new distance
#Move the segment end but keep it a little behind and below the camera.
##zuck
###self.segment.node().getSolid(0).setPointB(
###self.target.getRelativePoint(camera, P.Point3(0,-2,-1)))
self.segment.node().modifySolid(0).setPointB(
self.target.getRelativePoint(camera, P.Point3(0,-2,-1))
)
#end EdgeScreenTracker