Edge Blending

 

Multi-projection Wizard
This manual will guide you through the process of connecting two or many projectors into a seamless screen.
This functionality requires the Group of Projectors created.

How to connect the image from two projectors into a single screen?
There are two basic methods of blending images.

The simple method of connecting an image from multiple projectors is called Overlay
Overlay increases the Illuminance of the projection. With the Overlay method, you simply use Editor to mapp the same Objects on top of each other. You don’t need Edge Blending for that.
Note: When performing Overlay it may help to activate the Outlines Forever function. With the Outlines Forever activated, it will be easier for you to fit the Objects frames on top of each other. (Lumiverse UI/Settings/Editor Settings/Outlines Forever)

The more complex method of connecting image from multiple projectors is called Array
With the Array Method, more projector images are welded together into a single screen. A certain Edge Overlap (typically around 15%) is used on the edges to enable for very smooth image seam.

How to connect an image from multiple projectors in an Array?
First, access the Group Control and switch the Group to ON state
Use Group Control to Create a New Project.
Switch the Group to the New Project.
Now, leave the Group Control and Access each projector’s Editor and follow this set of steps:
Add Object (+), Apps </>, Tools folder, Solid
Select Solid in Editor, select Edit Object, select Editor Symbol Tab, select Fit To Screen
Select Solid in Editor, select Edit Object, and set Solid to full white (255, 255, 255)
Select Solid in Editor, select Edit Object, navigate to Filters, select Add Filter (+), select Multicanvas Filter.
Repeat this for all projectors in the Group.

Now, with all projectors projecting the full white in full screen you should physically organize (tilt, move, rotate, zoom) the projectors to fully illuminate desired surfaces. You can organize projectors into Rows, Columns or Rectangles. Tetris-like shapes are not supported. We recommend an edge overlap of around 15%. Fix the projectors in place.

Access Editor of any projector member of the Group and select the Solid object and select Edit Object. Navigate to Filters, open the Multicanvas filter sub-menu (three dots) and select Edit Filter. This is where you control the Multicanvas Filter. First, we need to create a new Topology. Topology is like a sub-group. It allows you to create separate sub-screens in larger groups. For the purpose of this manual, we will only work with a single topology. Create a new topology and give it a name. The topology will appear as a new item under the Topology Tab. Now, you need to access Multicanvas Filter in all projectors in the Group and connect each projector to the newly created topology. When adding projectors to the topology, a matrix of (+) buttons will appear around the device number. You need to select the appropriate (+) button so that the physical position of the projectors corresponds with the visualised scheme in the Multicanvas Filter.

Once you finish adding projectors to the topology, you need to align all Solid Objects in the Editor to form a perfect Rectangle. Use corner dragging and adjust perspective deformation of Solid Object each projector’s Editor to form a perfect rectangle with 90 degrees angles and precise edge alignment.

When you finish aligning objects, you can proceed to the next step, called Edge Overlap. Has to be done for all projectors in the Group. Select the Solid Object in the Editor, hit Edit Object, navigate to Filters, open sub-menu in the Multicanvas item (three dots), select Edit, and open the Edge Overlap Tab. There is a slider (s) controlling the position of a black line, projected over the white surface. Use the Edge Overlap slider to position the black line precisely on the edge of the neighbour projector. If the lines are not parallel, switch back to Editor and adjust the position of the Solid Object corners to fine tune the geometry. Than navigate to the Multicanvas Filter and adjust the Edge Overlap slider to perfect alignment with the edge. The edge of the neighbour projector should be in the middle of the Edge Overlap black line. Repeat this with all projectors in the Group.

Once you have all Edge Overlap lines aligned to neighbour projector edges, you can test the set-up with an image or video of your choice. Select Solid Object in Editor, hit Edit Object, navigate to Editor Symbol Tab, and select Change Source. Locate your desired media source and do this for all projectors in the Group. After this step, you should see your image well overlapped. If you experience imperfections, you need to improve the alignment of the Objects in Editor or you need to fine-tune the Edge Overlap parameter within the Multicanvas Filter.

Once you are happy with the geometry of the resulting image, you can proceed to Edge Blending. Select the Object in Editor, hit Edit, navigate to Filters, open the Multicanvas Fitler sub-menu (three dots), and change the Multicanvas Filter Mode from Adjustment to Blending. Repeat for all projectors. Use the Gamma slider (Multicanvas Filter) to fine-tune the blend curve.