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I am trying to make a city landscape but I can't figure out how to make those fancy rocks on the beaches. I've tried multiple things but they don't seem to work out well. Any help would be appreciated. Thank you.

Edit - These are four conical sided rocks.

These are four sided conical edged rocks

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Here are some methods for a 4 studs shape:

First method (Boolean):

  • Create a cylinder (12 vertices), put its origin to its bottom.
  • Duplicate it with a shiftDenter.
  • Rotate the copy 120° (or whatever angle you need) on the Y axis.
  • Duplicate the second cylinder and rotate it 120° on the Z axis.
  • Again create a fourth cylinder and rotate it 120°.
  • Now use some Boolean modifiers to merge these 4 cylinder.
  • Remove doubles to make the final object clean. You should not have any vertices inside your mesh but if it happened just delete them.

enter image description here

Second method (non-Boolean):

1 - Create a cône of 3 vertices, Radius > 1, Depth > 1.5, it gives a 4 faces pyramid

2 - In Edit mode, select all the vertices, and bevel them with ctrl shift B

3 - Select the 4 hexagons of the shape

4 - Extrude the hexagons with alt E > Individual Faces

5 - You have a basic 4 studs shape

You can add a Subdivision Surface modifier, you can make each end round with W > Loop Tools > Circle, you can add Edge Loops, etc...

enter image description here

Third method (better non-Boolean):

1 - Create a cône of 3 vertices, Radius > 1, Depth > 1.5, it gives a 4 faces pyramid

2 - Subdivide each angle of the pyramid

3 - Select all the new vertices and scale up so that you have some kind of regular hexagons on each 4 faces of the shape

4 - Select all the faces and alt E > Extrude Individual

5 - Keep the end of each extrusion selected and W > Loop Tools > Circle

6 - You can add a Subdivision Surface modifier, can add Edge Loops, etc...

enter image description here

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  • $\begingroup$ Neat. Now all that's left to do is make a few dozen, give 'em a bit of rigid body love, and see whether they interlock like the ones on the beach. $\endgroup$ – Robin Betts Jun 25 '18 at 18:40
  • $\begingroup$ @moonboots I tried your method bit it doesn't look like the reference. In reference, all the four sides of the rock are intersecting without any spaces or gaps in them like a pipe joint. imgur.com/a/T1DenB2 $\endgroup$ – AshKB Jun 26 '18 at 7:02
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    $\begingroup$ Ashutosh, I've edited my post to propose another solution, I hope it fits your needs $\endgroup$ – moonboots Jun 26 '18 at 9:41
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A lazy way to do this.

Enable the Add Mesh: Extra Objects enter image description here

Add>Mesh>Mechanical Objects>Pipe Joints>Pipe Y Joint.

enter image description here

It will give you a base object like this:

enter image description here

Select the loop rings on the center and scale them.

enter image description here

Then extrude the outer edges and scale at will.

enter image description here

enter image description here

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  • $\begingroup$ I think you also got confuse with the image. He says its 4 side not 3 side $\endgroup$ – atek Jun 26 '18 at 3:29
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Start with the cylinder. Shift +A add cylinder.

Rotate the cylinder to Y axis.

In the edit mode extrude one end of the cylinder and scale down.

Add one loop with Ctrl+R

enter image description here

In the edit mode move the mesh to get the pivot point edge of the cylinder.

Add Shift +A add empty.

Select the mesh and press Shift+Ctrl+Alt+C and select origin to 3D cursor.

Add a Array modifier from modifier tab. Increase the count 3 and select empty as object.

enter image description here

Finally adjust the shape and bevel the end with Ctrk+B

enter image description here

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  • $\begingroup$ Atek, it's supposed to be a 4 sides shape, you've made a 3 sides shape $\endgroup$ – moonboots Jun 25 '18 at 16:06
  • $\begingroup$ @moonboots look above in the reference image its 3 side $\endgroup$ – atek Jun 25 '18 at 16:11
  • $\begingroup$ Actually these are for conical sided rocks. Thanks for the help though. $\endgroup$ – AshKB Jun 25 '18 at 16:11
  • $\begingroup$ to me it's a 4 sides shape, anyway, here is a solution for 4 sides (in the 4th picture, just bevel the vertices with ctrl shift B), I don't know if it's the best though: zupimages.net/up/18/26/zgh4.jpg $\endgroup$ – moonboots Jun 25 '18 at 16:16
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    $\begingroup$ @atek Actually I've visited this place and I know its a four-sided rock. This might probably help - ibb.co/i4G8LT $\endgroup$ – AshKB Jun 25 '18 at 16:22

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