Tutorial 3 – Zooming, Snap Plane & Selection

  • Download project files for this tutorial here (52 Mb, it’s the same file as for the previous tutorial);
  • A video of this tutorial is available here;
1. Loading the project
Use the ‘File|Open Project’ command in the menu bar to open the file ‘block_tutorial.vtp’.
2. The Zoom Tool
For detailed tracing in a small region of an image, use the Zoom Tool Image:32px-Png_zoom.png longdesc= to zoom in on that region.
Image:BlockTut2-1-cropped.jpg longdesc=
Left click and drag to change the 2D position of the frame. Move the frame so that the region of interest is near the centre of the window. Image:BlockTut2-2-cropped.jpg
Right click and drag to zoom in, scaling the region until it fills most of the window. Image:BlockTut2-3-cropped.jpg
3. The Snap Plane
Use the Sketch Tool Image:32px-Png_pencil.png longdesc= to draw the front face of this block.
Image:BlockTut2-4-cropped.jpg
Move to a view where both of these blocks are visible, and use the Zoom Tool Image:32px-Png_zoom.png longdesc= to scale the view so that they fill most of the window. Image:BlockTut2-5-cropped.jpg
When modelling aligned objects like these two blocks, the Snap Plane Tool Image:32px-Png_snap_plane.png longdesc= lets you set a plane that is used to align the models of these objects in 3D. Select the Snap Plane Tool Image:32px-Png_snap_plane.png longdesc= and click on the new face to set the snap plane. Image:BlockTut2-6-cropped.jpg
New points added while the snap plane is active will be set to lie on this plane. Draw the face of the second block with the Sketch Tool Image:32px-Png_pencil.png longdesc=. With the snap plane active, yellow guide lines will appear, which can be used to align edges and vertices on the plane. By default, these are set to snap along existing edges and vertices. The snapping mode can also be set to align with the axes of the snapping plane. The snapping mode is chosen from the menu at the top of the window. Image:BlockTut2-7-cropped.jpg
To inspect the 3D structure created so far, switch to the Virtual View Image:Tb_virtual.png longdesc= by clicking the button at the top left of the window. Select the Navigate Tool Image:32px-Png_rot.png longdesc=, and right click and drag on one of the faces to rotate the view. By changing the view, we can see that both faces lie on the snap plane. Image:BlockTut2-8-cropped.jpg
Click on the button at the top left of the window to return to the Image View Image:Tb_virtual.png longdesc=. To model the bridge between the two blocks, start by selecting the Divide Tool Image:32px-Png_blue_pencil.png longdesc=, and adding two points at the base of the bridge. Image:BlockTut2-9-cropped.jpg
Add the front face of the bridge with the Sketch Tool Image:32px-Png_pencil.png longdesc=. As the snap plane is still active, this face will also be aligned with the snap plane. Image:BlockTut2-10-cropped.jpg
Add a curve to the bridge with the Curve Tool Image:32px-Png_pencil_curve.png longdesc=. Deactivate the snap plane by clicking ‘Reset Plane’ at the top of the window. Image:BlockTut2-11-cropped.jpg
4. The Select Components Tool
The Select Components Tool Image:32px-Png_select.png longdesc= is used to select faces, vertices, and edges. By selecting a group of faces, operations such as extrusion can be applied to multiple faces at once. To select the three faces, hold shift and click on each with the Select Components Tool Image:32px-Png_select.png longdesc=.
Image:BlockTut2-13-cropped.jpg
To extrude the set, click and drag on one of the faces with the Extrude Tool Image:32px-Png_extrude.png longdesc=. Click ‘Commit’ at the top of the window to complete the modelling. Image:BlockTut2-14-cropped.jpg

You’ve now created a 3D model in VideoTrace. You can generate textures for the model(s) from the images using the tools under the ‘Tasks’ menu, and export it from the ‘File’ menu.