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What's the best way to model a bottle that has a solid glass bottom like this one? I've already modelled the basic shape but I'm stuck as to how I deal with solid base. Is it a case of extruding the model into itself and trying to follow the shape or maybe I should model the bottom separately and attach them?

enter image description here

enter image description here

Any step by step instructions would be much appreciated :)

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The exterior of the bottle makes a transition from rounded-square to circular profile:

enter image description here

..here, a loft, using Bridge Edge Loops between a plane with its corners CtrlShiftB bevelled, and a duplicate of it, put through Loop Tools > Circle.

CtrlB Bevel the top circle to reference, scale the inside and extrude, to form the neck of the bottle. Give the bottle a Solidify modifier. Don't worry about the shell at the bottom of the bottle, it will be deleted. It's maybe more convenient to uncheck 'Fill Rim' in the modifier before applying it.. it will make selection simpler:

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(Below left) With everything hidden, still in Edit Mode, create a UV sphere with 12 segments to match the existing profiles. We want a little less than a hemisphere, so, here, 7 rings. The top half is deleted, and the remainder adjusted to reference. AltN > Flip its normals. It's on the inside.

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(Middle, above ) Now, the inner shell is un-hidden, its bottom face deleted,its bottom edge GG slid upwards and scaled, making a nice- looking gap to be bridged, again using Bridge Edge Loops. (You may need to rotate the hemisphere through 360/24 degrees in Z, first, to avoid twist.)

(If you need to cut further loops to aid the transition, or just for more even density of faces, don't forget Loop Tools > Circle doesn't need to be applied at 100%.)

Unhide the rest of the bottle, bridge the rim, put in some bevels by hand to sharpen edges under subdivision, and put on your Subdivision Surface modifier:

enter image description here

You can probably render better than this.. I've got a feeling there's some fakery going on in your reference :)

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  • $\begingroup$ THANK YOU SO MUCH- this is perfect ! $\endgroup$ Sep 29, 2021 at 15:20
  • $\begingroup$ Hi there, would you mind sharing the project file so I can see how you've built this? much appreciated if you could :) $\endgroup$ Oct 5, 2021 at 20:33
  • $\begingroup$ @Joe Sure. I'll get to it tomorrow.. I think it's there, OK... $\endgroup$ Oct 5, 2021 at 21:12
  • $\begingroup$ @JoeChapman I'd deleted it, so had to reconstruct using my own instructions! 'That'll learn me', as they say down here in Devon, UK. Construction steps in 'Steps' collection .. here it is: pasteall.org/blend/23d1d003ad70454e8d9b5415dce8635b $\endgroup$ Oct 6, 2021 at 8:27
  • $\begingroup$ Incredible! you've been a massive help, thank you so much :) $\endgroup$ Oct 6, 2021 at 8:32

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