# Plot3D returns empty box

**URL:** <https://community.wolfram.com/t/plot3d-returns-empty-box/5110>\
**Category:** Questions\
**Tags:** control-systems, engineering, mathematica\
**Created:** [March 14, 2015, 12:04am UTC](https://community.wolfram.com/t/plot3d-returns-empty-box/5110 "2015-03-14T00:04:09Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![traganeus](https://avatars.discourse-cdn.com/v4/letter/t/50afbb/32.png) [@traganeus](https://community.wolfram.com/u/traganeus)\
**Post date:** [March 14, 2015, 12:04am UTC](https://community.wolfram.com/t/plot3d-returns-empty-box/5110/1 "2015-03-14T00:04:09Z")

</div>

Hi, i am using `A1 = Plot3D[Availability[T1, T2], {T1, 0, 8760}, {T2, 0, 8760}` and the result is an empty box. Does anyone knows why i’m having this issue? Basically the plot functions works fine, but the graphics are not displayed…

---

<div class="post-metadata">

**Author:** ![djmpark](https://yyz1.discourse-cdn.com/wolfram/user_avatar/community.wolfram.com/djmpark/32/4435_2.png) [@djmpark](https://community.wolfram.com/u/djmpark)\
**Post date:** [March 14, 2015, 12:42am UTC](https://community.wolfram.com/t/plot3d-returns-empty-box/5110/2 "2015-03-14T00:42:11Z")

</div>

You don’t give enough information to tell. What is the Availability function? Perhaps it is returning complex numbers?

Use the Code Sample button (upper left above the input panel) to enter complete code, the function definition and the plot statement, into your posting and you will have a better chance for an answer. (Select the code in your notebook. Copy As Input Text and paste into the posting. Then select it and use the Code Sample button.