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6
Quick start guide and geometry alignment
Fill in two input fields:
Bottom edge
and
Height of the wall
. Use three buttons
Store...
To spawn 3 cones on 3 corners of the LED
volume/wall. Top right, bottom left and
bottom right. If the cones are not exactly on
the corners of the LED, move them
manually using only
x
and
y
axes, as we
assume the height is set correctly. When
that’s
done, test with camera pan, tilt, zoom
and position change if the cones stick to the
corners in all circumstances. If not, verify
the quality of StarTracker auto-align
procedure and lens calibration.
Mind that there will probably be delay
between the cones and the video. You can
adjust the delays using
Timed Data
Monitor
, which is
Unreal’s
tool to manage
delays.
Rectangular LED wall
If the screen is simply a rectangle you can
use Mesh builder to generate the mesh.
Select
XRMaskBP
object and click Assign LED
plane. Go through the steps indicated in
Mesh Builder section on page 5 and 6. If
there are multiple screens, just place more
XRMaskBP
objects and repeat the procedure.
Delays correction with Timed
Data Monitor
Open the panel from Window/Developer
Tools. If
it’s
not present enable the Timed
Data Monitor plugin.
Use
Time Correction
value (in seconds) to
delay the tracking. Watch
Timing Diagram
and make sure the vertical bar is green and
safely inside the buffer. If
it’s
not, set the
Buffer Size to a higher value
Use the augmented cones as reference to
set the delays. Pan the camera in a series of
short, sharp movements to see if the cones
stay on the corners of the LED. Stop
between the movements to distinguish
whether the cones or the video moves first.
Adjust the
Time Correction
.
Before using Mesh Builder
Go to project settings -> Collision.
Verify two custom Object Channels
exist:
RefPlane
and
LED
.
The final composited image is
achieved by replacing all pixels
that are outside of the
XRMaskBP
with computer generated pixels.
