arrow widget thickness parameter
fix rgb and bgr incompatibility
cube wire_frame fix using vtkOutlineSource
Image widgets implementation, GridWidget: vtkExtractEdges instead of Wireframe
initial CameraPositionWidget implementation using eye, look_at, up_vector
camera position widget: constructor with no parameter, constructor with intrinsic matrix for visualizing frustum
fix aspect_ratio in camera position widget, add scale parameter (tentative implementation of scale)
CameraPositionWidget: constructor with Vec2f fov (tentative)
avoid memory leak in mesh widget
initial implementation of trajectory widget
trajectory widget with frustums
plane widget size fix
shorten Trajectory widget implementation
remove unnecessary declaration
overlay image widget constructor with Rect
image 3d widget use texture instead of imageactor for more flexibility (such as resizing)
image 3d widget with position, normal, up_vector
intial implementation of frustum + image (the color of the frustum is currently dependent on the first pixel of the image)
add const keywords to gridwidget constructor
Gridwidget with plane coefficients