(2021-12-13, 7:26)大卫·曼利 Wrote: 大概你想要这样的链接动画？



我使用本论坛帖子中描述的链接脚本完成了此操作，稍微调整了您的模型以尝试说明如何设置链接动画的部件。修改后的 LDraw 文件可以在这里下载。

希望这足以帮助，但如果没有，欢迎您在这里发布问题。

问候，

大卫

(2021-12-13, 7:26)David Manley Wrote: Presumably you are wanting something like this for the linkages animation?



I did this using the linkages script as described in this forum post, tweaking your model a bit to try to illustrate how to set up the parts for the linkages animation. The modified LDraw file can be download here.

Hopefully this is enough to help but if not, you're welcome to post questions here.

Regards,

David


Thank you very much ,this is exactly what i want
several days ago , i'v read your reply abou linkage in other place in  this forum ,but the program you code in lua is difficult for me . i can use it as the way you show in the video Thannk you very much 
by the way ,if I want to let the whole model rotate around Z-axis  and the wheel in the model near the motor to rotate 
How can I modify your program

• the crank and coupler linkages were not quite rotated in the correct place to align. They are now.
  
• I made the parts for the lower axle assembly into a sub-model. It made the animation script easier.
  

(2021-12-14, 16:18)liu Wrote: Thank you very much for solving the problem
This program work well for that assembly,even i find how to change the speed of the assembly rotate around the Y axis
But yesterday i made another assembly and used gear to transmit power
The driver gear is 8 teeth ,next to it is a 40 teeth gear ,
Now ,I don’t know how to change the speed of the driver gear . it should be 5-times faster than the 40teeth gear next to it,at same tome it has the opposite rotation 



 i upload the files to GoogleDrive  check here 

Looking forward to your help

(2021-12-14, 16:18)liu Wrote: <snip>

Now ,I don’t know how to change the speed of the driver gear . it should be 5-times faster than the 40teeth gear next to it, at the same time it has the opposite rotation 

(2021-12-14, 19:35)David Manley Wrote: In the function on4BarFrame, towards the end of the function, immediately after the line

Code:

driver_lo = ldc.subfile():getRef("driver.ldr")

insert this

Code:

    rotation_lo:setRotate
    (
      math.deg(rotation_angle_ln) * 5,
      (animation_rotation_axis_mn == 1 and -1 or 0),
      (animation_rotation_axis_mn == 2 and -1 or 0),
      (animation_rotation_axis_mn == 3 and -1 or 0)
    )

By way of an explanation, the code tweak I did for your "08" model leveraged that the angle of rotation of the crank was the same as the angle of rotation required by the driver. Since it was a 1:1 speed ratio and with the rotation in the same direction, it could use the same rotation matrix. This amendment is multiplying the angle by 5 and computing a different rotation matrix for the driver. The sign of the X, Y or Z axis is inverted (set to -1) so that the rotation is in the opposite direction.

Regards,

David

(2021-12-15, 5:09)liu Wrote: the left rocker should move follow the right rocker , but I tried , couldn't make it

(2021-12-15, 8:09)David Manley Wrote: That is because the linkage animation script works only for a 4 (or 3) bar construction. By my counting, your "10" model is a 7 bar linkage construction. That requires calculations which do not exist in the linkages script. So I'm afraid I can't help you with this one.

Regards,

David