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  I suppose that is a camera parameters problem .The engine that i use (wild magic 4) have this parameters: m_spkCamera->SetFrustum(-1.0f,1.0f,-1.0f,1.0,1,2.0f); Vector3f kCLoc = Vector3f(0.0f,0.0f,1.0f); Vector3f kCDir = -Vector3f::UNIT_Z; Vector3f kCUp = Vector3f::UNIT_Y; Vector3f kCRight = Vector3f::UNIT_X; m_spkCamera->SetFrame(kCLoc,kCDir,kCUp,kCRight);the vectors are location(kCLoc), direction(kCDir) , up (kUp) and Right(kCRight)the camera params aresetFrustum : 0 right min1 right max2 up min3 up max4 distance min5 distance maxhow i change these params for correct the problem?Thanks   
  What is happening to make you think there's a problem? Your "distance max" parameter seems suspiciously small. (Note that I've never used this engine.)   ;  I do it so small because is the position of the plane with the texture.I would see grabbed camera texture at fullscreen.the problem become that when the modelview matrix returned by the artoolkitplus have a translation z that go over the plane , then result covered by the plane.for that that i'm understand the marker and his specific shape permit the measure of the position of the camera with an interpolation , then i must do an expression:the marker of 80 mm / the position of the camera in mm = the marker on video of x px / the position in the camera that can be(0 , 0, 0 ).may be?Thanks   