Six barrels,
An axis of rotation.

1. Create a new Generic Model and name it my_gatling_proptexture set to 64 × 64, use the face-to-face UV to save .bbmodel first.
2. The front end faces +XY for height, Z for thickness. Create the outermost layer of Display, Pivot as 0 / 10 / 0.
3. Under Display, build Body and Handles first. Open stage 01 to compare the main outline: 13 squares in total, 3 groups.

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1. Create in Body body_main，Position −13 / 6 / −4，Size 11 / 8 / 8,Rotation is 0/ 0/ 0.
2. Use the top, bottom, back cover and patches on both sides to separate the layers. Position is the starting point of the block, not the center; the component Pivot is reserved according to the parameter list.
3. Add two upper columns, a handle and two rear grip profiles to Handles. They remain stationary with the subject and are not put into the Rotor.

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Create under Display Rotor. The lengths of the six cuboids are all along X: Size is 23 / 1.5 / 1.5. They are arranged around Y=10, Z=0 with a center distance of 3.2Virtual Modelling Unit. The table below shows the center; when filling in Position, subtract 0.75 from each of Y and Z, and fill in 0 for X.

For example barrel_1 is The Z rotation of 0 / 12.45 / −0.75. The small end squares, dark end faces and bright strips are also arranged along the respective barrels. There are 8 pieces in each of the two circles of decorative frames, and the X rotation of the single piece is set at 0°, 45°...315°; this is an appearance decoration, not a real mechanism.

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Add 11 pixel decorations of Details to get 65 blocks, 5 groups. Select Rotor and set the group Pivot to 0 / 10 / 0. The basic rotation of the group remains 0 / 0 / 0, and actions are added to the timeline later.

Display
├─ Body       静止外壳
├─ Handles    静止提把
├─ Details    静止装饰
└─ Rotor      41 个部件一起绕 X 旋转
   ├─ 六根枪管、端面和亮条
   ├─ 两圈装饰框
   └─ 中央造型块

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1. Import textures/gatling-palette.png, give the gray green to the shell, blue gray to six tubes and darkest to the side.
2. Enter painting mode and observe the 64x64 atlas. Use 1 pixel light edge to distinguish turns, without having to paint every piece very brightly.
3. barrel_marker_1 Use yellow, and the remaining five bright strips use light gray. It's hard to see the rotation when all six are exactly the same, and the only yellow mark helps you follow a full circle.

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Return to edit mode, select body_mainLeft UV corresponds 0 / 0 / 16 / 16.barrel_1 Use 16 / 16 / 32 / 32Yellow tag. 16 / 32 / 32 / 48. These are the four boundary values ​​of U1 / V1 / U2 / V2, not the position plus width and height.

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1. Switch animation mode, create new gatling.spin, duration 2 seconds, loop the Loop.
2. Select Rotor to add a key frame only in the Rotation orbit. 0, 90, 180, 270, 360Y and Z have been zero. Time in order is 0, 0.5, 1, 1.5, 2 seconds.
3. All interpolations are set to Linear / linear, and then play it. The body and the lift don't move. Only the barrel is spinning continuously.

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1. Copy animation as gatling.spin_slow, the length should read 4 seconds. The five keyframes are moved to 0, 1, 2, 3, 4 seconds; the X angle is still 0, 90, 180, 270, 360.
2. Switch between the two animations and observe the yellow mark: normal display is 2 seconds for one cycle, and slow display is 4 seconds for one cycle. Don't overlay two clips.
3. Save your copy, reopen it, and make sure the texture, Rotor pivot, and two animations are still there. Turning off "auto-rotate viewing angle" on the web page will make it easier to verify that the gun body is really not moving.

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