![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiipVli5iFacPtI91cibESoJ6OdGLIP3IJ7C8Pmfx1DIlPnAsrhq-eeUDOVpbEtpV_IwNKeqKdn7hVTrj5GYcOAPx7bwitjqQbNU9Cq_ZRwe1OdwfaSDZcb6RftNR5s8klPGI-StTXtsTw/s200/xGEN_Slab+Depression+L-Shaped-sm.jpg)
I added the slope lines and constrained their end points to the planes. That was fine as long as the floor drain was placed separately, but I realized that automatically locating it at the intersection of the slope lines was a challenge.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtKI7lT0cDkv_DYcsTEs0Xmow2FnJom0qZRafPa-QWbNUDImT5xXgoDT7URzIkvJr_Ojx5vtIi3IbCvbrP8z7u3MdKQe2udI8EoZ3AevLJ5p84l6QQ4W3lwGQ1TpltSyvDES855g5yjME/s200/SD+Axo.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEJAmn7teTBC1bdhSG7IuK66kR2M9kcmGAIvkfIOJJI7mSiNZcqhOU9uUSULJVN0zS-dP8lzOsox2YdhGT_srgmne9hyphenhyphenH9F4VJ0mSj4K2evO46d7UhLtl4h5QRtW1xlLBgvFZSW_rEhuo/s200/GEN_Slab+Depression+L-Shaped.png)
New 'Offset' instance parameters were established to control the location. The drain annotation was aligned and locked to the reference lines.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDNn9VGVGFUEjHVJrbXvSdS2xYUcy5TlMWRmE2kOQeRlf9y5Pjgm3_vfZQLTcE_otgVUS20T3Ptc1hU8Isw-BZ_lg6ufSBTDuBZF19xP3tOEKajgYfZceoA67SgWSycuJ7-r_hkKLneJs/s200/SD+Object+Styles.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiW1IEAe6rpjqXawXIlRH-V5Uk-buyMdzlfG7AWMF1TwdBUYf3WwNbf4GXYzB088xUf3SC3nHt5YldDc_MZtKp4f49_kb5E2QHKztb4H7dxjU8USiU9kMkPoOObgXlcKXTm9QeJPH6CrgQ/s200/SD+Grips.png)
When the object is highlighted in the model triangular grips appear for all parameters. I have also revised the original rectangular slab depression, incorporating these improvements.
Revit is expansive.
For all three families download GEN_Slab-Depression.zip from the Files and Families tab above .
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