Immersive Calibration PRO – External Mesh Screen Shape

Jun 21, 2019

Immersive Calibration PRO – External Mesh Screen Sape

Immersive Calibration PRO supports a large number of built-in parametric screens shapes for automatic alignment and edge – blending. The set of built-in parametric screens shapes covers almost all standard multi-projection setups.

But, did you know that Immersive Calibration PRO also supports a custom shape screen. Users can provide a 3D model (External Mesh) of the screen shape and Immersive Calibration PRO will use this model to perfectly auto-align and edge-blend the projectors. Both camera and projector based mapping are supported.

NOTE: External Mesh is not available in the standard Immersive Calibration PRO which is distributed with the Ultimate Licenses. External Mesh screen shape requires additional licensing options. Contact us for more info. We will provide you with detailed information about the licensing and the format of the 3D screen model.

For this tutorial we will use a specially designed screen with curved edges.

The multi-projection system consists of 4 projectors and 3 cameras for auto-alignment.

The projectors are configured is 2x2 setup.

Start Immersive calibration PRO, select Custom mesh screen and load the screen mesh .obj model file in the screen definition window.

For Custom Mesh auto-alignment, users need to provide a set of 3D references points that correspond to the points on the 3D screen. Those reference point will be used in the camera views to map the screen into the camera.

Define each camera view as a “Mapped to reference point (Full)”. Select the camera for the view and select which projectors are visible in this camera view. Do this for all cameras.

The 3D reference points should be clearly marked on the screen surface and visible in the camera view. At least 6 points need to be visible per camera view.

In each camera view add the 3D reference points that are visible in this view and using the mouse of keyboard move the reference point marker in the camera view to the corresponding marker on the screen.

Make sure the Show screen mesh is checked and press the Auto-map button to automatically map the projection screen mesh in the camera view. If the mapping is not accurate, add more screen reference points to the view.

Once the screen mesh is accurately mapped in the view, scan all projectors in the view.

After the scanning is completed, calculate the auto-alignment and edge blending and select a polar image for a preview.

This type of projection is more suitable for 3D image generators engines. Next step is to calculate the perspective views for each projector and to calculate the auto-alignment and edge blending for perspective views. This will produce perfect 100% accurate geometrical correction and edge blending when the image generators engine create images for each projector.

Export the results and proceed to the next steps to integrate the auto-alignment with the Immersive Display PRO warping and blending and the Image Generator engine.
Fro the purpose of this tutorial we will use Unity. Immersive Calibration PRO exports a camera rig for Unity.

Load the corresponding _multi.procalib files in Immersive Display PRO, copy the exported unity files to the unity folder. In unity import the camera rig asset and recompile the unity project.

When Unity uses the exported camera rig configuration, it will generate perspective correct images for each projector. When the auto-alignment and edge-blending is applied, the projection will be perfectly aligned.

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