This past week I worked on figuring
out how to merge two models together. This process is little longer than I anticipated
but does not change my view on it being worth it. I did not encounter this
problem earlier because the test models I was capturing were sitting on a base
where I did not need to capture and in retrospect it would have probably been
best to learn the merging process earlier.
I managed to successfully merge one
of the artifacts together while the rest are in different stages of this process.
The process involves placing a set of points on each model with the key being
to place point 1 in the same location on both models. So point one will be in
the same location on the artifact just placed on both models. This process is
continued to at least three times, however the more points placed the higher
the accuracy is during the merging processes. The purpose for placing these
points is to tell the program which points match up across both models so they
can align correctly. The difficulty is
in the form of finding a place on the model that is identifiable which is not
always easy depending on the model, finding the right ridge on an arrowhead
takes time as well as finding multiple points that are identifiable.
Thankfully
I learned that, once merged, Metashape can categorize all of the millions of points
in the point cloud and separate these based off of a certainty rating that looks
like a heat map. I can then easily remove all points that Metashape created yet
was uncertain of its exact location while preserving the majority of points
that are slotted into their correct position. This can save me a lot of time
cleaning the models and removing the uncertain points by hand. This is an
advanced feature I haven’t seen in free modelling programs and the longer I use
this program the more I grow to understand more of its complexity.
I still
need to take this process slowly as I double check and review the steps that I
am taking to get more used to it but I will go ahead and print a copy of a broken
arrowhead that was created with the merged models and one with the blank side
filled in by default to best see and compare the differences between them.
Perhaps the detail will transfer well into the physical form or perhaps it will
be too hard to tell.
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