Comment by damarberlari

thanks!

currently the path is expressed as function of (t), and it's the t that progressed at the constant speed.

so the cube will finished one loop at the same duration, and thats why it moves much slowly at the beginning and end, where distance of one loop is smaller.

I have to admit I made it that way because it's simpler to implement:D. Making it move at constant speed require some more works, but others have provided some solutions here so I think I'll try