Does anyone have any advice on how I can model this specific nail varnish bottle for a client? The base of the bottle is a sort of triangle and becomes a rounded and circular at the lid? any advice on how I can create a shape that's triangular at the bottom and circular at the top would be great!
Create a 3 vertex circle, bevel the vertices:
Create additional vertices on the edges, scale a bit:
Extrude up and right click > LoopTools > Circle:
Create horizontal edge loops in order to follow the bottle profile:
Give it a smooth shading and a Subdivision Surface modifier:
Here is a step by step guide to get the general shape of this, since it's triangular the difficulty of creating this shape is greatly increased. But you can get on the right track by following along.
Step 1: create a cylinder object, and set the vertices to 3.
This will give us the base of our object
Step 2: Bevel and subdivide, make sure to have a reference image handy in your scene to figure out how much you need to do this.
Step 3: Now delete the top half of your object, select a loop left at the top, duplicate it, and align it with the circular area near the top of the bottle. Then with the loop tools addon enabled, right click, and turn it circular.
Step 4: Now select the triangular section top loop again, and the circular one, and go back to the loop tools menu, but this time select bridge.
Step 5: Add some edge loops in there, scale them and proportionally edit everything until it looks right, add in the lid, add a glass-like principled bsdf shader, extrude an interior, and bam you've got yourself a sally hansen bottle.
Sorry if this isn't terribly in depth, I am assuming that you have some experience with Blender just don't know how to go about making this specific shape. If you'd like I can edit it to be a bit more detailed.