Designing a Chair. Lesson 6

Transcription

1 Designing a Chair Lesson 6 Designing a Chair This lesson will show you how to design a chair by using the Curves Network modeling tool in a few steps. We will focus your attention on the following modeling tools: Curves Network. Skin. Intersect. Trim. Mirror. Learning solidthinking 1

2 Lesson 6 Let s begin by drawing the basic curves. Drawing a network of curves 1) If you are already working with solidthinking, choose the New command from the File main menu and Save the scene you were working on. Otherwise, you must first run solidthinking. 2) Choose the default layout option from the Layouts panel (choose View 4 Layouts). 2 Learning solidthinking

3 Designing a Chair 3) Select NURBS curve icon and create a curve in the Front view for the frontal profile of the chair. Set the Local Axes Origin = 0, 0, 0 and use the image below as reference guide. Press Spacebar to end. For your convenience, we provide herewith points coordinates: #1(-5, 0, 0); #2(-5, 0, 5); #3(-7, 0, 9); #4(-8, 0, 9). 4) Select the NURBS curve icon and create a second curve in the Front view for the frontal profile of the chair. Set the Local Axes Origin = 0, 0, 0 and use the following image as reference guide. Press Spacebar to end. Learning solidthinking 3

4 Lesson 6 Points coordinates are: #1(5, 0, 0); #2(5, 0, 5); #3(7, 0, 9); #4(8, 0, 9). 5) Select the NURBS curve icon and create a curve in the Top view for the upper profile of the chair. Set the Local Axes Origin = 0, 0, 0 and place your points according to the values given below. Press Spacebar to end. 4 Learning solidthinking

5 Designing a Chair Points coordinates: #1(-8, 0, 9); #2(-8, 3, 9); #3(-7, 12, 12); #4(-5, 15, 20); #5(0, 15, 20); #6(5, 15, 20); #7(7, 12, 12); #8(8, 3, 9); #9(8, 0, 9). 6) Select the NURBS curve tool and create a curve in the Right view for the top profile of the chair. Insert 0, 0, 0 as default Local axes origin and use the image below as reference guide. Press Spacebar to end. Points coordinates are: #1(0, 15, 20); #2(0, 13, 9); #3(0, 12, 0). 7) Select the NURBS curve icon and create a curve in the Top view for the top profile of the chair. Set the Local Axes Origin = 0, 0, 0 and use the following image as reference guide. Press Spacebar to end. Learning solidthinking 5

6 Lesson 6 Points coordinates: #1(-5, 0, 0); #2(-5, 1, 0); #3(-6, 2, 0); #4(-6, 8, 0); #5(-3, 11, 0); #6(0, 12, 0); #7(3, 11, 0); #8(6, 8, 0); #9(6, 2, 0); #10(5, 1, 0); #11(5, 0, 0). The curves you have created should be similar to those of the figure below. 6 Learning solidthinking

7 Designing a Chair 8) You will now create the surface that passes through these curves by means of Curves Network. Select all the vertical curves and press Spacebar, then pick the horizontal curves and press Spacebar again to conclude the procedure. Now you need to build the central portion of the chair. 9) Select the NURBS curve icon and create a curve in the Right view. Set the Local Axes Origin = 0, 0, 0 and use the following image as reference guide. Learning solidthinking 7

8 Lesson 6 Points coordinates: #1(0, 16, 9); #2(0, 11, 6); #3(0, 5, 6); #4(0, 0.8, 6); #5(0, 0.5, 4.6); #6(0, 1.5, 3.4); #7(0, 0.9, 0). 10) Translate the curve rightwards as indicated in the illustration below. 8 Learning solidthinking

9 Designing a Chair 11) Click now the Extrude icon and then select the curve created in the previous step. Type 22 as Extrusion Length. The extruded curve will appear as below. Delete this object 12) You now want to intersect the two surfaces and discard the portion that you do not need. Use the Intersect tool and select the first and the second surface. Answer YES to the Store each face as a separate object? console prompt. Type B at the Choose which curves will be split prompt. Select the external separate object (see previous image) and use the Edit 4 Delete command. Learning solidthinking 9

10 Lesson 6 Note: as you can see from the previous image, a new group containing the two separate surfaces has been created in the world browser. Let s now create two openings to the seat for decorative purposes. 13) Select the Top view and click the Ellipse: focuses, point icon. The first point will tell where the ellipse should start from; the second and third points will be the two focuses of the ellipse. 10 Learning solidthinking

11 Designing a Chair Focus#1(-4.9, 7, 0); Focus#2(-4.9, 3.9, 0); Point(-4.6, 5.7, 0). 14) Duplicate the ellipse just created by copying and pasting. Move it to the other side of the chair. Learning solidthinking 11

12 Lesson 6 These two curves will serve to cut out the mid surface. 15) Select Trim, then the first created ellipse (Curve), and ultimately, the sitting section of the chair (Surface). 16) Click the Trim icon again. Select the second ellipse (the copy), and then the trimmed surface. Your project should now look like the one in the following figure. 12 Learning solidthinking

13 Designing a Chair Building the legs Your last task is building the legs to the chair. 1) Select the NURBS curve icon and create a curve in the Right view. Insert 0, 0, 0 as default Local axes origin. Use the image below as reference guide. Press Spacebar to end. 2) Points coordinates are: #1(0, 2.5, 5.9); #2(0, 2.5, 4.4); #3(0, 2.7, 2.5); #4(0, 2.8, 0.7); #5(0, 2.7, 0). 3) Once you have created the curve, move it rightward referring to the next figure. Learning solidthinking 13

14 Lesson 6 4) Click the Top view and select the Circle: center, radius icon. Use 0, 0, 0 as default Local Axes Origin and 0.3 as Radius value. The circle you have created will be so positioned. 14 Learning solidthinking

15 Designing a Chair 5) To create the chair s leg, select the Pipe icon; then, as Profile curve, choose the circle created in step 4 and select the curve (step 1) as your Extrusion path curve. 6) Activate Mirror and select the chair s leg as your object to be mirrored. Press Spacebar, and when the Console calls for Mirror along, answer X. Learning solidthinking 15

16 Lesson 6 7) Activate again the Mirror command and select the two front legs as object to reflect. Press Spacebar. At the Console prompt Mirror along, type Y. 8) Make sure you have selected this latter mirrored object in the World Browser and activate the Edit Mode. Two blue dots which serve to control the mirror effect will appear in the Top View. Normal end point Normal start point 16 Learning solidthinking

17 Designing a Chair 9) Activate Snap to grid#2 through Edit 4 Active snap 4 Grid 2. 10) From the Top view, select the blue dot Normal start point and drag it to the location defined by the following image. Note: to precisely position the said point, you can also assign X, Y, Z coordinate values to 0, 6, 0 in the Modeling Tool panel of the mirrored object. Normal Start Point new location 11) You can now hide the construction curve still present in your scene by activating the Hidden in interactive views button found in the World Browser (Hidden in rendering will be automatically enabled). Hidden in rendering Hidden in interactive view Learning solidthinking 17

18 Lesson 6 Once you have completed this last command, your chair is ready and you can see the complete model in the following figure. 18 Learning solidthinking