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- Alternate ISO "default" View

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Feb 06, 2014
06:30 PM

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Feb 06, 2014
06:30 PM

Alternate ISO "default" View

WF4, M220

I need to create an alternate view that is essentially like the default isometric view, but starting with a different front view, if that makes sense. I remember a long time ago seeing angles to rotate from a front view to get to default, can anyone tell me how to do that?

Thanks,

--

I need to create an alternate view that is essentially like the default isometric view, but starting with a different front view, if that makes sense. I remember a long time ago seeing angles to rotate from a front view to get to default, can anyone tell me how to do that?

Thanks,

--

7 REPLIES 7

Feb 06, 2014
06:37 PM

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Feb 06, 2014
06:37 PM

On 02/06/14 16:30, Doug Schaefer wrote:

>

> WF4, M220

>

> I need to create an alternate view that is essentially like the default isometric view, but

> starting with a different front view, if that makes sense. I remember a long time ago seeing

> angles to rotate from a front view to get to default, can anyone tell me how to do that?

>

Starting from the front view do this:

+- 45 deg about vertical

+- 35 4/15 deg about horizontal

Doing all the combinations of +- 45 about vertical and then +- 35 4/15 about horizontal will give

you all the possible isometric views.

> Thanks,

>

> *--*

>

> *Doug Schaefer*|

>

> WF4, M220

>

> I need to create an alternate view that is essentially like the default isometric view, but

> starting with a different front view, if that makes sense. I remember a long time ago seeing

> angles to rotate from a front view to get to default, can anyone tell me how to do that?

>

Starting from the front view do this:

+- 45 deg about vertical

+- 35 4/15 deg about horizontal

Doing all the combinations of +- 45 about vertical and then +- 35 4/15 about horizontal will give

you all the possible isometric views.

> Thanks,

>

> *--*

>

> *Doug Schaefer*|

Feb 06, 2014
06:40 PM

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Feb 06, 2014
06:40 PM

This is good advice. That's how we had to do it at Cummins Diesel.

Feb 07, 2014
09:20 AM

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Feb 07, 2014
09:20 AM

I remember having this lying around. See attached for various view orientations.

Thanks,

jef

Feb 07, 2014
09:22 AM

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Feb 07, 2014
09:22 AM

as someone said....I remember old way of dynamically rotating about an

edge.

Feb 07, 2014
09:33 AM

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Feb 07, 2014
09:33 AM

Those numbers don't seem to agree with the out-of-the-box "Trimetric" view. Looking at the front view I need to tip the model forward (horizontal axis) 51.57 degrees and then rotate left (vertical axis) 22.91 degrees to match the existing trimetric view.

I use derivatives of these values for the user defined default orientation to get "Z" pointing up (world CS) instead of at the screen from a front view. (-38.43 = 51.57 - 90)

[cid:image001.png@01CF23DE.509E7EB0] [cid:image005.jpg@01CF23DF.663FCC50]

I hate the way this comes setup out of the box. In my mind the Z axis should be coming out of the top plane, not the front plane.

[cid:image004.png@01CF23DF.66362F60]

I use derivatives of these values for the user defined default orientation to get "Z" pointing up (world CS) instead of at the screen from a front view. (-38.43 = 51.57 - 90)

[cid:image001.png@01CF23DE.509E7EB0] [cid:image005.jpg@01CF23DF.663FCC50]

I hate the way this comes setup out of the box. In my mind the Z axis should be coming out of the top plane, not the front plane.

[cid:image004.png@01CF23DF.66362F60]

Feb 07, 2014
09:57 AM

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Feb 07, 2014
09:57 AM

The exact numbers are in radians.

From a front view rotate about the horizontal .9 radians (51.5662...deg) and then rotate about the vertical -.4 radians (-22.9183...deg).

Mike Foster

ATK

[cid:image004.jpg@01CF23C9.8B1065A0]

From a front view rotate about the horizontal .9 radians (51.5662...deg) and then rotate about the vertical -.4 radians (-22.9183...deg).

Mike Foster

ATK

[cid:image004.jpg@01CF23C9.8B1065A0]

Feb 07, 2014
06:15 PM

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Feb 07, 2014
06:15 PM

For those who still care:

To get a right elevation angle of alpha and a left elevation of beta, starting with the alpha edge at zero and the beta edge directly into the screen, there is one rotation about the vertical axis followed by one rotation about the horizontal axis.

The vertical rotation angle = atan(sqrt(tan(alpha)/tan(beta) ))

The horizontal rotation angle = asin(sqrt(tan(alpha)*tan(beta) ))

Excel formulas, using a cell named alpha and another named beta:

H rotation =DEGREES(ATAN(SQRT(TAN(RADIANS(alpha))/TAN(RADIANS(beta)))))

V rotation =DEGREES(ASIN(SQRT(TAN(RADIANS(alpha))*TAN(RADIANS(beta)))))

For alpha = 30, beta = 30, Isometric,

vertical rotation = 45 = atan(sqrt(1)) (because alpha = beta, tan(alpha)=tan(beta))

horizontal rotation = 35.264389682755 (you have a calculator...)

For alpha = 15, beta = 30, (typical, but not unique) Trimetric,

vertical rotation = 34.26465 and some degrees

horizontal rotation = 23.161231226046 and some degrees