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11/10/13
Constr ai ni ng at attr i butes of a D ynami c Component | Sk SketchUp Knowledg e Base
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Constraining attributes of a Dynamic Component This is a Pro only feature. A constrained dynamic component is a component that has elements (sub-components or sub-groups) that, when scaled with the Scale tool, will not change size or orientation to the axes. To constrain entities of a dynamic component: 1. Create Cre ate a new component that is comprise d entirely from groups or sub-component instances, ea ch with a unique unique name. Following is an image of the fence component used in this example. This component contains 4 sub-components: post,top rail, bottom rail, and picket sub-components. The parent component and each sub-component have a unique name. For example, the parent component is called Fence and it contains Post, TopRail, BottomRail, and Picket subcomponents.
Note: Configuring a dynamic component component is eas ier when the component component is placed at the origin of the axes in SketchUp.
2. Context-cl ick on the component. The component's context menu is displayed. 3. Select the the Dynamic Components > C ompon omponent ent Attributes menu item. The Component Attributes dialog box is displayed. 4. Click the + button next to the Fence component. An empty list of attributes appears for the component.
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Constraining attributes of a Dynamic Component | SketchUp Knowledge Base
Click on the add attribute button in the last row of the Fence component. A list of predefined attributes is displayed. The field is opened for editing. Click on Position in the list of predefined attributes. All of the position attributes are displayed for the component. Click on the add attribute button in the last row of the Fence component. A list of predefined attributes is displayed. The field is opened for editing. Click on 'Size ' in the list of predefined attributes. All of the siz e attributes are displayed for the component. The following image shows these attributes within the Fence component.
All of the attributes are faded gra y color to indicate they are not constrained to a specific value. Double-cli ck in the field next to the LenY attribute in the Fence component. The field is opened for editing. Erase the current value. Type =4 in the 'LenY' fie ld to constrain the length of the Fence component in the Y direction (the fence cannot be scaled in the Y direction). Press the Ta b key to accept the formula. The value for LenY (4) is displayed in black to indicate it is c onstrained (the fence ca nnot be resize d using the Scale tool). Click on the + next to the TopRail sub-component to display its attributes. Click on the add attribute button in the last row of the TopRail component. A list of predefined attributes is displayed. The field is opened for editing. Click on Position in the list of predefined attributes. All of the position attributes are displayed for the component. Click on the add attribute button in the last row of the TopRail component. A list of predefined attributes is displayed. The field is opened for editing. Click on 'Size ' in the list of predefined attributes. All of the siz e attributes are displayed for the component. Double-cli ck in the field next to the X attribute in the TopRail sub-component. The field is opened for editing. Erase the current value. Type =4 in the 'X' field of the TopRail to constrain the TopRail to 4" along the X axis from the Fence's origin (to acc ommodate the 4" width of the Pole). G enerally, you want all of your sub-component's values constrained. Some of the parent's values might be constrained depending on the type of component you are creating. For example, the Fence's thickness (LenY) is constrained to 4". But all other values, including Fence's location to SketchUp's axes (X,Y, and Z) are unconstrained so it can be moved anywhere and scaled in the X and Z directions (LenX and LenZ).
Note: Constrained values appear in solid black text. Unconstrained values (va lues that could be altered when scaling a component) are in light gray.
22. 23. 24. 25. 26.
Press the Ta b key to accept the formula. Double-cli ck in the field next to the Y attribute. The field is opened for editing. Erase the current value. Type =1.25 in the 'Y' fie ld of the TopRail to constrain the TopRail to 1.25" along the Y axis from the Fence's origin (the middle of the Pole). Press the Ta b key to accept the formula.
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Constraining attributes of a Dynamic Component | SketchUp Knowledge Base
27. Double-cli ck in the field next to the Z attribute. The field is opened for editing. 28. Type =Fence!LenZ-9 in the 'Z' field of the T opRail to constrain the Pole's Z value using a formula based on the overall height of the Fence (Fence!LenZ). 29. Press the Ta b key to accept the formula. The va lue of TopRail's Z is constrained to 9 inches below the length of Fence ( Fence!LenZ). The following image shows the changes made in s teps 9 through 29:
Tip: Move the cursor over a field and click the mouse button to create a reference to the content in that field in your formulas. For example, clicking on the LenZ field of Fence would place 'Fence!LenZ' in the c urrently edited formula.
30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41.
Double-cli ck in the field next to the LenX attribute. The field is opened for editing. Erase the current value. Type =Fence!LenX-Post!LenX in TopRail's 'LenX' field. The length of the TopRail will be constrained to the length of Fence minus the length of the post (4") . Press the Ta b key to accept the formula. Double-cli ck in the field next to the LenY attribute. The field is opened for editing. Erase the current value. Type =1.5 in TopRail's 'LenY' field. The thickness of TopRail is set to 1.5". Press the Ta b key to accept the formula. Double-cli ck in the field next to the LenZ attribute. The field is opened for editing. Erase the current value. Type =3.5 in TopRail's 'LenZ' field. The height of TopRail is set to 3.5". Press the Ta b key to accept the formula. All of TopRail's default attributes are now constrained so that the component will not change its position and size when scaled. The following image shows the changes made in steps 30 through 41:
42. Continue constraining a ll of the default attributes (X,Y ,Z, LenZ, LenY, and LenZ) for ea ch of Fence's sub-components. Hint: you will want to constrain the LenZ of the picket to some value that is relative to the Fence's LenZ so the picket resizes proportionally to the fence in the Z ( blue) direction. 43. Click on the Close button. 44. Use the Sc ale tool to scale your component. The component should only scale in the directions that are unconstra ined (the X and Z directions). Sub-components should retain their dimensions (such as post and picket width and depth).
