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Got SDF collision mesh generation (via marching cubes) working with Jolt Physics! The collision mesh is regenerated when the SDF scene changes. Individual SDF primitives can be made "dynamic", which adds them as physics objects. 1/

Mike Turitzin

7,385 subscribers

10,942 Aufrufe • vor 1 Jahr •via X (Twitter)

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11 Kommentare

Profilbild von Mike Turitzin

Mike Turitzinvor 1 Jahr

You can see the collision mesh later in the video. It's much lower res than the resolution used for rendering (and rendering is done via ray-marching a 3D texture rather than triangle meshing). 2/

Profilbild von Mike Turitzin

Mike Turitzinvor 1 Jahr

The video covers it up pretty well, but I'm actually just generating a single collision mesh "chunk" right now - so the obvious next step is to chunkify the whole world and add/remove chunks as the camera moves around. It's cool to see things more interactive! /end

Profilbild von Elise Oyin

Elise Oyinvor 1 Jahr

All in Christ Jesus for all ages, every efs each using sap on eaic decree with their living spirits, souls, faiths, wills, efs plead the Blood of Jesus Christ of Nazareth pbz to destroy all stopping the true form of Elise Oyinkromeineifa's pregnancy from being in Yahweh's name

Profilbild von Makan Ansari

Makan Ansarivor 1 Jahr

This is so impressive! Editing SDF with Physics in real time!

Profilbild von Yeltan

Yeltanvor 1 Jahr

that's so cool, but how do you have sdf objects use this collision mesh while maintaining good performance? if i were to wanna make something with sdf physics, are there resources you'd recommend?

Profilbild von Mike Turitzin

Mike Turitzinvor 1 Jahr

The main cost is regenerating the collision mesh when the (static) SDF scene changes. I think I can get that fast enough, though, as the collision mesh resolution doesn't need to be very high. I'm using Jolt physics and feeding it triangle meshes:

Profilbild von Breakaway

Breakawayvor 1 Jahr

Nice mesh construction. I'm curious though, isn't it more performant and less hassle to use the SDF as the collision object directly?

Profilbild von Mike Turitzin

Mike Turitzinvor 1 Jahr

Maybe, but I'm not aware of straightforward ways to do this for arbitrary SDFs. A big complicating factor is that smooth blends (as well as subtractions) make the distance field a bound rather than exact, which means it becomes a lot harder to compute overlaps.

Profilbild von Leo Benaducci

Leo Benaduccivor 1 Jahr

Did you try Surface Nets? I believe they are faster to generate but also have lower quality

Profilbild von alxo

alxovor 1 Jahr

what is the compute cost? nice job!

Profilbild von Scott Richmond

Scott Richmondvor 1 Jahr

Very cool stuff mate! I wish this kind of work was more readily available to developers to create more interactive worlds. Is this something you're planning to release in some form or another?

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📣 #NVIDIAKaolin v0.15.0 is out! With the latest release of our #Pytorch Library, extract a high quality #3D mesh for your SDF using Flexicube. Have a look at the updated official repository using Kaolin's implementation: ➡️ 🧵1/2 #NVIDIAResearch

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Did you know that in Blender you can easily make pillows with the 'Cloth' modifier? ✨ 1. Select the object that's gonna be beneath your pillow 2. Press 'Collision' on the physics tab 3. Add a cube and add some loops to it with Ctrl+R 4. Press 'Cloth' on the physics tab 5. Enable 'Pressure' and set the custom target volume to 1. You can tweak this value depending on how big your pillow is 6. Decrease the collision distance in 'Object Collisions' 7. Press space to play the animation 8. Press Ctrl+3 to add a subdiv modifier with 3 levels to make it look smoother! You can choose a frame that you like and apply the 'Cloth' modifier to make it into a static mesh by going to the Modifiers tab, hovering over the 'Cloth' Modifier and pressing Ctrl+A! For better results add more loops to your original mesh! ✨ #b3d

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passivestar

174,886 Aufrufe • vor 3 Jahren

SDF commander Mazloum Abdi told Aryen TV, a PJAK-affiliated outlet (PJAK is the PKK’s Iranian offshoot), that the SDF does not want to join or integrate into the current HTS-led army, but instead seeks a merger to jointly build a new “national army.” “We’re not saying we will join them. We want to jointly build a Syrian army. The SDF is a large force; in size, we are comparable to the Damascus army. So we need to build a new defence force for Syria together, and the SDF should have a special and distinct role within it,” Abdi said. We have reported this point before: the SDF is framing its position as a merger to create a new army, not absorption into the existing force. From our September report: “What is new now, as the SDF and Syrian government enter more serious negotiations about the SDF’s future and Syria’s governance, is that the SDF appears to be putting forward an alternative proposal to keeping its own unified bloc. Rather than integrating the SDF, estimated to be a 100,000-strong force, into the currently forming HTS-led army, their new proposal—put forward by Sipan Hamo, long a shadowy figure who led the YPG, the SDF’s backbone, but was kept out of the spotlight due to Turkish sensitivities—suggests the two should merge on equal footing to build a joint military council as a first step toward rebuilding “a new national army that includes all Syrians and is based on a comprehensive democratic project.” This proposal reflects a strategic shift. The SDF is no longer merely resisting absorption into Damascus’s structures; it is now engaging Damascus on its own terms. By framing the discussion around a merger rather than integration, the SDF is effectively saying: if the government does not want parallel armies, then it must negotiate the terms of a joint force, one in which the SDF would become a coequal pillar of a newly reconstituted Syrian army. In this scenario, the SDF positions itself not just as a faction to be dissolved, but as a central partner in shaping and ruling the new Syria.”

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The National Context

116,501 Aufrufe • vor 7 Monaten

Flexible Isosurface Extraction for Gradient-Based Mesh Optimization paper page: This work considers gradient-based mesh optimization, where we iteratively optimize for a 3D surface mesh by representing it as the isosurface of a scalar field, an increasingly common paradigm in applications including photogrammetry, generative modeling, and inverse physics. Existing implementations adapt classic isosurface extraction algorithms like Marching Cubes or Dual Contouring; these techniques were designed to extract meshes from fixed, known fields, and in the optimization setting they lack the degrees of freedom to represent high-quality feature-preserving meshes, or suffer from numerical instabilities. We introduce FlexiCubes, an isosurface representation specifically designed for optimizing an unknown mesh with respect to geometric, visual, or even physical objectives. Our main insight is to introduce additional carefully-chosen parameters into the representation, which allow local flexible adjustments to the extracted mesh geometry and connectivity. These parameters are updated along with the underlying scalar field via automatic differentiation when optimizing for a downstream task. We base our extraction scheme on Dual Marching Cubes for improved topological properties, and present extensions to optionally generate tetrahedral and hierarchically-adaptive meshes. Extensive experiments validate FlexiCubes on both synthetic benchmarks and real-world applications, showing that it offers significant improvements in mesh quality and geometric fidelity.

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28,318 Aufrufe • vor 1 Monat

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20,126 Aufrufe • vor 8 Monaten

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ScharoMaroof

16,126 Aufrufe • vor 8 Monaten

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RO2⚡️

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12,819 Aufrufe • vor 1 Jahr

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chacha🎸

174,482 Aufrufe • vor 4 Monaten

The latest on the SDF’s integration into the Syrian state: Just hours after SDF commander Mazloum Abdi’s meeting with Syrian President Ahmad al-Sharaa, the full US withdrawal from Syria was announced as complete. One notable detail is that Qasrak airbase, the site vacated by the final American forces, lies on the strategic M4 highway and inside the Hasakah zone that remained under SDF control after the final integration agreement was sealed. Yet based on videos that emerged after the US withdrawal, the base appears to have been handed over to HTS-led elements of the Syrian Army’s 60th Division, which the SDF is set to join. The footage shows dozens of Turkish-made BMC vehicles entering the base to deploy there. More importantly, when the US left, the SDF’s anti-terror unit, known as YAT, appeared to be waiting to hand the base over to the Syrian Army, indicating clear coordination and suggesting that implementation of the integration deal is progressing relatively smoothly. It is also notable that both Qasrak and, a month earlier, Rmelan airbase appear to have been handed over to HTS-led brigades known to operate Turkish-made weaponry. These two bases matter because Qasrak overlooks the M4, while Rmelan sits beside the strategically important Rmelan oilfields. Both are located inside the zone that remained under SDF control after the cessation of hostilities at the end of January. The Syrian government is also set to take over all prisons in Hasakah, while the courts are to be transferred to Damascus-linked institutions. Damascus-linked officials involved in the integration process have said this could happen as soon as next week. At the same time, the SDF appears to be receiving more positions within the Syrian government than initially expected, with the SDF bloc emerging as an important pillar of governance. Its role is set to extend beyond the defence and interior ministries to the foreign ministry, justice ministry, and other state institutions. Meanwhile, the SDF is transitioning into politics following its formal dissolution as a separate armed entity, with strong indications that Mazloum Abdi himself may move into a political role. This also appears to fit into the PKK’s broader rebranding across the Middle East and its effort to better align its political entities across the region, from Turkey to Syria and beyond. That process now appears to include a push for new cross-border media platforms aimed at strengthening coordination as these movements become more embedded in governance in Syria and, potentially, Turkey, while also aligning more closely with the PUK sphere in Iraq’s Kurdistan Region. The broader direction points toward a reconfigured cross-border political force emerging from the PKK’s transition in Turkey, where it has moved toward laying down arms and repositioning itself as a political actor. More:

The latest on the SDF’s integration into the Syrian state: Just hours after SDF commander Mazloum Abdi’s meeting with Syrian President Ahmad al-Sharaa, the full US withdrawal from Syria was announced as complete. One notable detail is that Qasrak airbase, the site vacated by the final American forces, lies on the strategic M4 highway and inside the Hasakah zone that remained under SDF control after the final integration agreement was sealed. Yet based on videos that emerged after the US withdrawal, the base appears to have been handed over to HTS-led elements of the Syrian Army’s 60th Division, which the SDF is set to join. The footage shows dozens of Turkish-made BMC vehicles entering the base to deploy there. More importantly, when the US left, the SDF’s anti-terror unit, known as YAT, appeared to be waiting to hand the base over to the Syrian Army, indicating clear coordination and suggesting that implementation of the integration deal is progressing relatively smoothly. It is also notable that both Qasrak and, a month earlier, Rmelan airbase appear to have been handed over to HTS-led brigades known to operate Turkish-made weaponry. These two bases matter because Qasrak overlooks the M4, while Rmelan sits beside the strategically important Rmelan oilfields. Both are located inside the zone that remained under SDF control after the cessation of hostilities at the end of January. The Syrian government is also set to take over all prisons in Hasakah, while the courts are to be transferred to Damascus-linked institutions. Damascus-linked officials involved in the integration process have said this could happen as soon as next week. At the same time, the SDF appears to be receiving more positions within the Syrian government than initially expected, with the SDF bloc emerging as an important pillar of governance. Its role is set to extend beyond the defence and interior ministries to the foreign ministry, justice ministry, and other state institutions. Meanwhile, the SDF is transitioning into politics following its formal dissolution as a separate armed entity, with strong indications that Mazloum Abdi himself may move into a political role. This also appears to fit into the PKK’s broader rebranding across the Middle East and its effort to better align its political entities across the region, from Turkey to Syria and beyond. That process now appears to include a push for new cross-border media platforms aimed at strengthening coordination as these movements become more embedded in governance in Syria and, potentially, Turkey, while also aligning more closely with the PUK sphere in Iraq’s Kurdistan Region. The broader direction points toward a reconfigured cross-border political force emerging from the PKK’s transition in Turkey, where it has moved toward laying down arms and repositioning itself as a political actor. More:

The National Context

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