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id="docs-internal-guid-b47c0c60-d22b-9941-fb44-8d4eca4a11f4">
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style="line-height:1.38;margin-top:0pt;margin-bottom:6pt;"><span style="font-size:16pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">Weekly Report #11 - Silhouette Operator</span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">Week 11 is now over and the deadline approaches rapidly. With only two weeks to go, the Silhouette Operator needs to be done soon. </span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">At the end of last week I had multiple issues and problems. Finding solutions for them was the first thing I did this week.</span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:700;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">The mesh problem</span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">In sculpting mode operations manipulate the base mesh structure. Without Bmesh it is a challenge to edit the topology. After discussing, we came to the conclusion that it is best to manipulate the mesh via the CustomData Api. I was able to implement a function which remaps the customdata arrays and allows the necessary behavior. I only need to design an undo/redo node to support those changes. </span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:700;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">The orthographic matrix</span></p>
<p dir="ltr"
style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">I was able to get the correct projections by first projecting onto an orthographic plane and then project to 2D.</span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">After solving both problems I continued to work on the intersection calculation.</span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">Last week i had already implemented a method to calculate the intersecting parts within the existing mesh. Relying on the result of this, I designed an algorithm to calculate the intersecting edges of the silhouette parts. </span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">Even though the algorithm delivers a precise result, it is currently very slow. I am hoping that i will be able to improve its performance in a later optimization step. </span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;"><b>The idea</b> is: Calculate two loops. One loop on the existing mesh and one loop on the silhouette. Then connect both loops smoothly while still passing the precise intersection loop. </span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">Today i started to implement a method to calculate the interior and exterior vertices. </span><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:700;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">In theory</span><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;"> i can easily implement a clipping tool by just flipping interior and exterior. A later subtractive mode for the tool will be rather quick to implement. </span></p>
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">The Plan is set and I hope I will be able to finish implementing this feature as soon as possible!</span></p>
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id="docs-internal-guid-b47c0c60-d22b-9941-fb44-8d4eca4a11f4">
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style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">Sebastian Witt
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