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(...) Hi Eduardo, All the models I enter are technic. Compared to brick building, technic is much harder. With the standard bricks, everthing is turned multiples of 90 degrees, and studs line up parallel to the x,y, or z axis. Jaco is right, it (...) (19 years ago, 6-Jun-05, to lugnet.cad)
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| | Re: What about a LEGO TECHNIC tutorial
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(...) Select the part you want it to pivot around then select the rest. It will always pivot around the pivot point of the first item selected. (...) You can make it visible and draggable with the mouse. (...) Down 2 LDU :) (19 years ago, 6-Jun-05, to lugnet.cad.mlcad)
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(...) But, rotations are limited to parallel to the X,Y and Z planes, so I don't think you are addressing what I'm talking about. Imagin you had an axle that is at 45 degrees in the XY plane, and you have a biped leg you want to rotate around the (...) (19 years ago, 7-Jun-05, to lugnet.cad.mlcad)
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(...) It oughtn't be too hard to do that. You just use the pin to define your normal vector and then just work backwards from the projection to work out the rotation matrix. I noticed today that MLCad already seems to have a routine to calculate (...) (19 years ago, 7-Jun-05, to lugnet.cad.mlcad, FTX)
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(...) Admittedly, I have oft wished for the ability to create custom rotation buttons so I could make X,Y,Z buttons for 11.25,15,22.5,27.125,30 and 45 degree rotations to accomodate the rotation angles of various technic parts... But I still love (...) (19 years ago, 7-Jun-05, to lugnet.cad.mlcad, FTX)
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| | Re: What about a LEGO TECHNIC tutorial
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(...) Mine settings are movement Large Move(XYZ)=10 Rotate(XYZ)=22.5 Medium Move(XYZ)=1 Rotate(XYZ)=15 Fine Move(XYZ)=0.001 Rotate(XYZ)=0.5 I spend most of my time in Medium and do ultrafine adjustments in Fine. I do occasionally (namely when (...) (19 years ago, 7-Jun-05, to lugnet.cad.mlcad)
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(...) That's not true. It is true that doing rotations around arbitrary axes requires a lot more understanding of what's going on, but MLCAD allows you to define the full 3D vector around which the rotation happens, so you can rotate in any plane. (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad)
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(...) Yeah, that would be great although you usually have to enter angles manually most of the time. What would be even cooler was custom grid buttons: So I don't have to change the default grid values each time I swich from working with models to (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad, FTX)
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| | Re: What about a LEGO TECHNIC tutorial
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(...) I think I forgot mentioning this yesterday, but that is excactly the point where it's practical to use submodels: Make a submodel with the axle and the biped leg. In the main model you turn the axle/submodel (45 degrees), and in the submodel (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad)
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(...) Travis, I understand 3D rotation matricies enough to know that they let you rotate around any axis, but I think MLCad's GUI only lets you rotate about, X, Y, or Z, because of limitations of its user interface. Michael has meta-commands for (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad)
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| | Re: What about a LEGO TECHNIC tutorial
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(...) I was actually referring to the current MLCad interface. In the keyboard entry rotation dialog (Edit->Rotate->Keyboard Entry), you can specify a full rotation vector, plus rotation angle. Specifying a vector with 1 or -1 in the X, Y, or Z axis (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad)
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(...) Not just a mouse, but Edit / Rotate / Keyboard Entry allows you to enter a full rotation matrix (among other things). Of course you need to know what matrix values to enter to get your desired result, but it's there in the GUI. (...) Yes, that (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad)
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(...) The new unpublished LSynth deals with this without any extra information. I use and LDraw file to desribe how to translate/rotate parts to the assumed default position/orientation. LSynth limits pulleys and gears to be planar. It also assumes (...) (19 years ago, 9-Jun-05, to lugnet.cad.mlcad)
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