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Mark Simpson demonstrates modelling arches

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Mark Simpson demonstrates modelling arches
A CreativeCOW Cinema 4D Tutorial

Mark Simpson demonstrates modelling arches
Mark Simpson Mark Simpson
Jam Digital, Redondo Beach, California, USA



Article Focus:
In this article Mark Simpson discusses a technique to model arches using Cinema 4D.



No project files. Follow along the tutorial to model your arches.



Create cube (400x, 150y, 400z), with 16 segments in the x and z dimension.
Make it editable, select the poly tool (visible only switch off), select all (rectangle marquee selection tool or command>A) except outside row of polys, and change the 'x' dimension from 650 to 300.
Repeat for z dimension


Create a circle spline (radius 150, position (-100y)).
With the cube object selected in the object manager, go into point mode (visible only off), and select all but 2 outside rows of points on both sides


Next, select the move tool and limit the move tool to the y axis, and then move the selected points as shown in screen shot using the circle spline as a reference


Again, using the selection tool, select all but the outside row of points as shown in screenshot

Again, using the move tool and the spline as a reference, move the points so that they are positioned on the spline as shown


Continue selecting rows of points (dropping the outside pair each time), and moving them until they are on the spline, until you have completed creating a rough 'arch' as shown below.


The last step is to select the center most row of points and move it onto the spline as well.

switch to side view and rotate the circle spline 90 degrees on y axis (H axis)
enable point snapping and choose point mode. Then select rows of points and move them along the Y axis using the circle spline as a reference just like we did before


Delete the phong tag from our cube object


Notice problem with stair stepping of edges where the arches meet. To remedy this we are going to create a new edge where each arch meets.

First, select all the problem (stair stepped) polys and delete them


Next, choose the 'create polygon' function and create a triangle polygon as shown by selecting the points that form the circumference of the new poly (see manual for more info on creating polygons)


Continue creating polygons until you have created new edges where the arches meet as shown below.




If you now render the model, you'll see that all of the edges where polys meet are showing and need smoothing. If we reapply a phong tag, we see that we can't find an angle setting that works which will both smooth out the arches and yet leave everything else nice and smooth.


So, the solution to this problem is to use HyperNURBs with Cinema 4D R8s' new weighting tools. To do this, first drop the cube object in a HyperNURBs object and then select the cube edges (edge tool) as shown below.



Next, set the edge weighting to 100%.


The result should look like the image below. Now our edges are nice and sharp where the arches meet, yet the arches themselves are still smoothed.


Now we're going to extrude the columns. Using the poly selection tool (poly mode), select the polys that we want to extrude for legs as shown above.

Inner Extrude -10 meters, then extrude 30 meters, following with an inner extrude of 10 meters. This creates a simple capital detail. Finally extrude to the length desired for the columns.





Finally, using the edge tool, select the newly created edges as shown, and set the edge weighting to 100%.


Now we're ready to texture and light our model prior to rendering.


Mark Simpson is a leader in the Cinema4D COW. Discuss this tutorial or other questions with him there.

Would you like to know more about Mark and see other articles written by him? Click here.

©2002 Mark Simpson and Creativecow.net. All rights reserved.




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Comments

Problems with this tut
by Dan Bantner
I am not one to be picky about free stuff, but when it's here to learn I often get frustrated when I try to complete it and I can't due to oudated app version and instructions. DO you think you could clearn up some questions I have?

1) The Edge Tool- After dropping the modified archway into the Nurbs Object, I do not see the red lines that you show after using the edge tool. Now I believe you are using 8.5, but with 11.5, am I missing this tool and how it is used? Your edges show that under the arch the crease goes through the modified arches we made in an earlier step. I can only now use the edge tool to select the edges of the newly created nurb box and half to select each edge manually. Am i missing osmething or a step somewhere? thanks


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