I want to know how to make some portion of an object porous?

Can any one tell me how to draw these kind of models?

Can any one help me in drawing this shape?

Dear Cotty,
Can you please teach me, how to draw the shape attached herewith.

Thanks and regards,
Ganagiah.

Can you please tell me how to draw, the model of the attached file. It is 2D image, similar to truncated octahedron. Kindly make a video and write what tool you are using in constructing such shapes.

Thanks and regards,
Gangaiah.

Thanks for sending screen shot. But, it is only half of the structure. Making it full was little tricky. The similar way, I have also followed and partially succeed.

It is not. Please see that two adjacent facets are not same. One is rectangle and another one is trapezoid. There is a difference.

Thanks and regards,
Gangaiah

How did u make one pyramid into octahedron? What option have you used to get exact alignment of pyramid to for octahedron. Can you please tell me ?

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This is the model, i am searching for. Thanks for your reply.

@dave r said:

[attachment=0:2jxchhn0]<!-- ia0 -->Oct.png<!-- ia0 -->[/attachment:2jxchhn0]

Like this?

Draw an octahedron. Or draw a pyramid, copy and flip it to make the other half.
Draw a face to cut where you want the truncation.
Select the geometry and run Intersect Faces>With Selection.
Delete the waste.

Can any one tell me how to draw truncated octahedron in sketchup?