Match Photo Lite – Part III

– The Chimney
The tall structure in the center was called the Housing or Chimney. There was a Feeder Trough at the top with Branch Troughs running the length. At each level water was sprayed over triangular Cypress cross-members.

The problem with converting this to 3D is that there is no connection to the pan we created in Part II. We can fix that though.

– A Centering Plane
There is a water pipe entering what I assume is the Feeder Trough at the very top of the structure. This being centered we can make use of it. The Feeder Trough is centered on the Chimney. The Chimney is centered on the Pan. So – the next step is to create a vertical plane that will bisect all of this.
PanCenterLineFirst draw a line down the center of the pan from the Right Side to the Left Side (X-axis). This is made simple by reason of the inference engine. Select the Line Tool. Hovering over the center of the Y-axis line nearest the camera a green dot appears at center. Click to anchor the line at that point and move to the other end of the pan. When you are centered on the other end you will see the green dot appear, a tool tip stating “Midpoint” will appear and the line turns red. Click to set the line.
CenterPlaneConstructThe line tool is still active so move vertically on the Z-axis (blue) until you are higher then the Chimney then left click to set the line. Come back down the X-axis (red) and infer the end of the line. Click to set that line.
CenterPlaneCompletetFinally add a vertical line to the ends of the two lines on the X-axis. The plane now constructed will fill in. So now we have a vertical plane on the X-axis/Z-axis that will bisect the Chimney.
CenterPlaneGraphicClick the Filename button (Fig.43_cropped) and the graphic will reappear and the model will rotate to align.
Measurement and Scaling
Since the next step is to move in equal distances from both ends I think it is probably time to scale the structure.

ladderblueOn the front is a ladder. Is is pretty wonky .. but I managed to drop a pair of lines along the rails (more or less) in the Z-axis and then three more lines across the rungs (more or less) in the X-axis. Here, I selected them so they would turn blue and show up better.

Rotating the model a little counter-clockwise makes it MUCH easier to work with as the graphic goes away.

ladderInitDimWith that let’s add some initial dimensions. These mean NOTHING .. they are just a place to start. Depending on your resolution of your graphic they can be anything. Click the Dimension Tool (there isn’t a hotkey for this tool). It is to the right of the Tape Measure Tool – the number 3 between two dimension lines. With the tool selected hover over the ends of the lines for the ladder. Click on a line end (green dot) then move to another to set the dimension then drag to where you want it. You can move this later any time by selecting the dimension and using Move (M).

How wide is a ladder? Got me – anything from 16 in. to 22 in. BUT .. rungs are spaced 10 in to 12 in. Those are the ones we can use to dimension this. See the two (means nothing) dimensions .. 0.396″ and ).430″? Those.

(Note: I have my default set to Decimal Inches. You can set that default to whatever you wish by – Window –> Model Info from the menu. You can select various Formats: Architectural, Decimal, Engineering and Fractional. Selecting Decimal you can then select Inches, Feet, Millimeters, Centimeters or Meters. Me .. I usually use Decimal Inches. That’s just me. I’ll leave it at that .. for a moment longer)

resize396We will use the Tape Measure Tool (T) to scale the model using one of those run spacings. Which one? Heck I don’t know. It WAS taken from a drawing after all. Let’s scale using both and see what the width of the ladder shows.

With the Tape Measure Tool selected hove over where the lines cross to form the 0.396″ dimension. Click one then the other. In the information bar at the bottom right you will see that 0.396″ dimension repeated. Now .. WITHOUT DOING ANYTHING ELSE … release the mouse and type 12 on the keyboard (presumption if you are following along you have your units set to decimal inches) and hit enter. A window will open up and ask if you want to resize the model. Click Yes.

FirstScalingYou will have a screen filled with a vastly zoomed in model .. you resized it after all and the camera didn’t move. From the menu select Camera –> Zoom Extents (Cntrl+Shift+E). Now you can use your scroll wheel to zoom so the ladder fills the screen.

With those two top rungs spaced at 12 in. the lower two are spaced at 13 in. .. and the ladder is a little bit less than 23 in. wide. Remember I said run spacing was from 10 in. to 12 in. so .. that is too large a spacing. Let’s try again.

SecondScalingNow .. let’s try scaling that 13.040″ dimension to 12 in. Repeat .. select the Tape Measure Tool (T) and click the two endpoints that mark that dimension; release the mouse; type 12 on the keyboard and hit enter. Again a window will open and ask you if you want to scale the model – select Yes.

Much better. The run spacings are 11 in. and 12 in. and the ladder width is 20 in. (more or less). That is WELL within the OSHA guidelines.

ArchitecturalScaleNow – one final thing before we leave this area. I as I said work normally in Decimal Inches. This is a structure – feet and inches are better when all is said and done. From the menu select Window –> Model Info. The Model Info window opens (duh). Select Architectural from the Format drop down – and close the window by clicking the little x at the top right of the screen.

Note: Having no further use for the ladder and it’s dimensions I used the eraser tool to delete it.

– Dimensions
PanDimensionedAt this point .. just for fun and just because I could .. I Zoomed to Extents and dimensioned the pan. Heck .. I was curious to see how big it was.

Note: The dimension for the pan height was a little large for that space so I moved it. Click the dimension with the arrow cursor to select it. Right click to get a context menu. From that menu I selected – Text Position > Outside End.

PanDimensionedFractional.. and just for the heck of it .. I set the Format to Fractional Inches.

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