Which tool is primarily used to manipulate 3D objects in Storyboard Pro?

The Layer Transform tool is the primary instrument designed for manipulating 3D objects in Storyboard Pro. This tool allows users to adjust the position, rotation, and scale of 3D elements within a scene, making it essential for working in a three-dimensional space. By using the Layer Transform tool, artists can interactively change how objects appear in relation to one another and the camera, facilitating effective storytelling through spatial organization.

While tools like the Contour Editor, Camera tool, and Selection tool serve important functions within the software, they focus on different aspects of the creative process. The Contour Editor tool is mainly used for adjusting the shape and lines of vector graphics, the Camera tool allows adjustments for camera angles and framing during animation, and the Selection tool helps in selecting and moving objects but does not specifically cater to 3D manipulation. Therefore, the Layer Transform tool stands out as the appropriate choice for directly manipulating 3D objects in Storyboard Pro.