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  #1  
Old 05-14-2008, 08:47 AM
Frank Verberne Frank Verberne is offline
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Join Date: Mar 2008
Location: Netherlands
Posts: 148
Strange bug concerning a mirror

Hi all,

I'm having some strange problems with my mirror. When I use viz.go(viz.HMD | viz.STEREO), the right half of the mirror doesn't reflect everything (mainly not my avatar and the frames of the paintings) but the left half does. When I use viz.go(viz.HMD), the whole mirror works fine. I have absolutely no clue why this happens, and it happens on both screens of the HMD in STEREO mode. Any clue on how to fix this problem is appreciated! See the pictures for the difference.
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  #2  
Old 05-14-2008, 06:00 PM
farshizzo farshizzo is offline
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Join Date: Mar 2003
Posts: 2,849
I've modified the original mirror sample script to support stereo. The main differences are that a render node must be created for each eye. Also, I had to increase the clip plane scale factor to remove the clipping issues. Let me know if this works:
Code:
import viz
viz.go(viz.STEREO)

REFLECT_MASK = viz.LAST_MASK << 1

def addMirror(mirror,mat=None):

	#If mirror matrix is not specifed, get matrix of mirror object
	if mat is None:
		mat = mirror.getMatrix()
		
	#Position of mirror
	pos = viz.Vector(mat.getPosition())
	
	#Direction mirror is pointing
	dir = viz.Vector(mat.getForward())
	dir.normalize()

	#Quaternion rotation of mirror
	quat = mat.getQuat()
	
	for eye in (viz.RENDER_LEFT,viz.RENDER_RIGHT):
		
		#Create render texture
		tex = viz.addRenderTexture()

		#Create render node for rendering reflection
		lens = viz.addRenderNode(size=[1024,1024])
		lens.setCullMask(REFLECT_MASK)
		lens.attachTexture(tex)
		lens.setInheritView(True,viz.POST_MULT)
		lens.disable(viz.CULL_FACE,op=viz.OP_SET_OVERRIDE)
		lens.disable(eye)
		
		#Setup reflection matrix
		rot = viz.Matrix.quat(quat)
		invRot = rot.inverse()
		lens.setMatrix(viz.Matrix.translate(-pos)*invRot*viz.Matrix.scale(1,1,-1)*rot*viz.Matrix.translate(pos))
		
		#Setup reflection clip plane
		s = -viz.sign(viz.Vector(dir) * viz.Vector(pos))
		plane = vizmat.Plane(pos=pos,normal=dir)
		dist = plane.distance([0,0,0])
		lens.clipPlane([-dir[0],-dir[1],-dir[2],s*dist+0.1])
		
		#Project reflection texture onto mirror
		mirror.texture(tex)
		mirror.texGen(viz.TEXGEN_PROJECT_EYE)
	
#Add gallery environment
gallery = viz.add('gallery.ive')

#Use existing painting as mirror and specify the matrix
mirror = gallery.getChild('art04-FACES')
m = viz.Matrix()
m.setPosition(mirror.getPosition(viz.ABS_GLOBAL))
m.setEuler(180,0,0)

#Apply mirror settings to mirror object
addMirror(mirror,m)

#Increase ambient lighting
viz.MainView.getHeadLight().ambient(1,1,1)

#Create a self avatar
avatar = viz.add('vcc_female.cfg')

#Link avatar body to viewpoint
avatarLink = viz.link(viz.MainView,avatar)
avatarLink.setPos([None,0,None]) #Keep avatar on floor
avatarLink.setEuler([None,0,0]) #Only update avatar yaw
avatar.setMask(viz.LEFT_MASK|viz.RIGHT_MASK,mode=viz.MASK_REMOVE) #Only draw avatar in mirror

#Link avatar head to viewpoint
head = avatar.getBone('Bip01 Head')
head.lock()
viz.link(viz.MainView,head,mask=viz.LINK_ORI)
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  #3  
Old 05-15-2008, 05:09 AM
Frank Verberne Frank Verberne is offline
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Join Date: Mar 2008
Location: Netherlands
Posts: 148
Hi farshizzo,

The modification of the original mirror script works fine. The only error in it is the line
Code:
lens.setMatrix(viz.Matrix.translate(-pos)*invRot*viz.Matrix.scale(1,1,-1)*rot*viz.Matrix.translate(pos))
This should be:
Code:
lens.setMatrix(viz.Matrix.translate(pos*-1)*invRot*viz.Matrix.scale(1,1,-1)*rot*viz.Matrix.translate(pos))
Thanks for helping me again!
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