Upload README.md

README.md

@@ -189,9 +189,6 @@ homepage: https://vlar-group.github.io/PhysInOne.html
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#random-sampling">3.4 Random Sampling</a><br>
 &nbsp;&nbsp;&nbsp;<a href="#download-selected-cases">4. Download Cases</a><br>
 <a href="#dataset-structure">📦 Dataset Structure</a><br>
-<a href="#data-splits">📊 Data Splits</a><br>
-<a href="#data-fields">🧩 Data Fields</a><br>
-&nbsp;&nbsp;&nbsp;• <a href="#physical-phenomena">Physical Phenomena</a><br>
 <a href="#annotation-details">📝 Annotation Details</a><br>
 &nbsp;&nbsp;&nbsp;• <a href="#depth">Depth</a><br>
 &nbsp;&nbsp;&nbsp;• <a href="#segmentation">Segmentation</a><br>
@@ -201,6 +198,9 @@ homepage: https://vlar-group.github.io/PhysInOne.html
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;◦ <a href="#camera-json-structure">Camera JSON structure</a><br>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;◦ <a href="#dynamic-camera-behavior">Dynamic camera behavior</a><br>
 &nbsp;&nbsp;&nbsp;• <a href="#point-clouds">Point Clouds</a><br>
+<a href="#data-splits">📊 Data Splits</a><br>
+<a href="#data-fields">🧩 Data Fields</a><br>
+&nbsp;&nbsp;&nbsp;• <a href="#physical-phenomena">Physical Phenomena</a><br>
 <a href="#license">📜 License</a><br>
 <a href="#citation">📚 Citation</a><br>
 <a href="#contact">📮 Contact</a><br>
@@ -438,6 +438,91 @@ TODO
 
 </div>
 
+<h2 id="annotation-details" style="margin-left: 0; font-size: 1.9em; line-height: 1.22; margin-top: 1.2em; margin-bottom: 0.5em;">📝 Annotation Details</h2>
+<div style="margin-left: 24px;">
+
+PhysInOne provides synchronized visual and physical annotations for each dynamic 3D scene.
+
+<h3 id="depth" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Depth</h3>
+<div style="margin-left: 16px;">
+
+Depth maps are provided in `.npz` format and are expressed in meters.
+
+</div>
+
+<h3 id="segmentation" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Segmentation</h3>
+<div style="margin-left: 16px;">
+
+Segmentation masks encode background, static foreground objects, and dynamic foreground objects.
+
+Expected encoding:
+
+| Pixel Value | Meaning                    |
+| ----------- | -------------------------- |
+| `0`         | Background                 |
+| `1-127`     | Static foreground objects  |
+| `128-255`   | Dynamic foreground objects |
+
+</div>
+
+<h3 id="captions" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Captions</h3>
+<div style="margin-left: 16px;">
+
+Each scene includes a `caption.txt` file containing an English paragraph that describes the visual elements and the physical activity.
+
+</div>
+
+<h3 id="trajectories" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Trajectories</h3>
+<div style="margin-left: 16px;">
+
+TODO
+
+</div>
+
+<h3 id="cameras" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Cameras</h3>
+<div style="margin-left: 16px;">
+
+Each scene includes multiple camera viewpoints to support 3D perception, reconstruction, and physics-based visual reasoning tasks.
+
+- Taichi-based MPM simulations (elastic solids, plasticine, granular substances, some Newtonian and Non-Newtonian fluids): 15 static cameras + 1 dynamic camera
+- Other scenes: 12 static cameras + 1 dynamic camera
+
+<h5 id="camera-json-structure" style="font-size: 1.02em; margin-top: 0.55em; margin-bottom: 0.12em; line-height: 1.16; font-weight: 700; margin-left: 48px;"><span style="display: inline-block; width: 1.02em;">&#9702;</span>Camera JSON structure</h5>
+
+<div style="margin-left: 64px;">
+
+Per camera:
+
+- `frames`: list of per-frame 4×4 camera-to-world (C2W) transformation matrices in **Blender coordinate system**
+- `camera_angle_x`: horizontal field of view (FOV) in radians, can be used to compute intrinsic focal length
+- `img_w`, `img_h`: image width and height in pixels
+- `trajectory_name`: name of the camera trajectory
+- `total_frames`, `fps`: number of frames and frames per second
+
+</div>
+
+<h5 id="dynamic-camera-behavior" style="font-size: 1.02em; margin-top: 0.55em; margin-bottom: 0.12em; line-height: 1.16; font-weight: 700; margin-left: 48px;"><span style="display: inline-block; width: 1.02em;">&#9702;</span>Dynamic camera behavior</h5>
+
+<div style="margin-left: 64px;">
+
+- The dynamic camera moves along a path randomly sampled on a hemisphere surrounding the center of the main objects, providing diverse viewpoints.
+- JSON frame indices correspond directly to video frame indices.
+
+</div>
+
+</div>
+
+<h3 id="point-clouds" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Point Clouds</h3>
+<div style="margin-left: 16px;">
+
+Each scene should include `points.ply`.
+
+The initial point cloud was obtained by back-projecting the pixels from each camera view in the first frame based on depth, followed by randomly sampling 100,000 points from the resulting data.
+
+</div>
+
+</div>
+
 <h2 id="data-splits" style="margin-left: 0; font-size: 1.9em; line-height: 1.22; margin-top: 1.2em; margin-bottom: 0.5em;">📊 Data Splits</h2>
 <div style="margin-left: 24px;">
 
@@ -554,91 +639,6 @@ This naming convention allows users to quickly parse scene metadata and link it
 
 </div>
 
-<h2 id="annotation-details" style="margin-left: 0; font-size: 1.9em; line-height: 1.22; margin-top: 1.2em; margin-bottom: 0.5em;">📝 Annotation Details</h2>
-<div style="margin-left: 24px;">
-
-PhysInOne provides synchronized visual and physical annotations for each dynamic 3D scene.
-
-<h3 id="depth" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Depth</h3>
-<div style="margin-left: 16px;">
-
-Depth maps are provided in `.npz` format and are expressed in meters.
-
-</div>
-
-<h3 id="segmentation" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Segmentation</h3>
-<div style="margin-left: 16px;">
-
-Segmentation masks encode background, static foreground objects, and dynamic foreground objects.
-
-Expected encoding:
-
-| Pixel Value | Meaning                    |
-| ----------- | -------------------------- |
-| `0`         | Background                 |
-| `1-127`     | Static foreground objects  |
-| `128-255`   | Dynamic foreground objects |
-
-</div>
-
-<h3 id="captions" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Captions</h3>
-<div style="margin-left: 16px;">
-
-Each scene includes a `caption.txt` file containing an English paragraph that describes the visual elements and the physical activity.
-
-</div>
-
-<h3 id="trajectories" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Trajectories</h3>
-<div style="margin-left: 16px;">
-
-TODO
-
-</div>
-
-<h3 id="cameras" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Cameras</h3>
-<div style="margin-left: 16px;">
-
-Each scene includes multiple camera viewpoints to support 3D perception, reconstruction, and physics-based visual reasoning tasks.
-
-- Taichi-based MPM simulations (elastic solids, plasticine, granular substances, some Newtonian and Non-Newtonian fluids): 15 static cameras + 1 dynamic camera
-- Other scenes: 12 static cameras + 1 dynamic camera
-
-<h5 id="camera-json-structure" style="font-size: 1.02em; margin-top: 0.55em; margin-bottom: 0.12em; line-height: 1.16; font-weight: 700; margin-left: 48px;"><span style="display: inline-block; width: 1.02em;">&#9702;</span>Camera JSON structure</h5>
-
-<div style="margin-left: 64px;">
-
-Per camera:
-
-- `frames`: list of per-frame 4×4 camera-to-world (C2W) transformation matrices in **Blender coordinate system**
-- `camera_angle_x`: horizontal field of view (FOV) in radians, can be used to compute intrinsic focal length
-- `img_w`, `img_h`: image width and height in pixels
-- `trajectory_name`: name of the camera trajectory
-- `total_frames`, `fps`: number of frames and frames per second
-
-</div>
-
-<h5 id="dynamic-camera-behavior" style="font-size: 1.02em; margin-top: 0.55em; margin-bottom: 0.12em; line-height: 1.16; font-weight: 700; margin-left: 48px;"><span style="display: inline-block; width: 1.02em;">&#9702;</span>Dynamic camera behavior</h5>
-
-<div style="margin-left: 64px;">
-
-- The dynamic camera moves along a path randomly sampled on a hemisphere surrounding the center of the main objects, providing diverse viewpoints.
-- JSON frame indices correspond directly to video frame indices.
-
-</div>
-
-</div>
-
-<h3 id="point-clouds" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 0;"><span style="display: inline-block; width: 1.08em;">•</span>Point Clouds</h3>
-<div style="margin-left: 16px;">
-
-Each scene should include `points.ply`.
-
-The initial point cloud was obtained by back-projecting the pixels from each camera view in the first frame based on depth, followed by randomly sampling 100,000 points from the resulting data.
-
-</div>
-
-</div>
-
 <h2 id="license" style="margin-left: 0; font-size: 1.9em; line-height: 1.22; margin-top: 1.2em; margin-bottom: 0.5em;">📜 License</h2>
 
 <div style="margin-left: 24px;">