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how to create my own dynamesh?

i need a dynamesh , if i use the dynamesh in lightbox, then the document size is now the size i want, if i change the size and when i resize or crop the document, there is a dynamesh left on canvas, which is super anoiying

i want to create a canvase withe the size i want, then create a dynamesh on it, but i can not find dynamesh in tools

what could i do?

Just follow the instructions I gave you for your movie size question. You can load the Lightbox Dynamesh and change the document size, you just need to clear the canvas (Ctrl+N) and redraw the model.

Thanks! but after cleaning the canvas, i do not know where could i add dynamesh, could you tell me?

First you must have an editable mesh drawn out and in edit mode (hit “T” right after drawing out you base shape).
Next MakePolyMesh 3D. Now you can DynaMesh it. Or you should be able to find a demo project to load. Sometimes stuff can get lost, There’s a Frame button and also the “F” key

I just feel that flatten brush and trimdynamic looks a little same, so what exactly are they different from each other?

what is the difference between flatten and trimdynamic?
I just feel that flatten brush and trimdynamic looks a little same, so what exactly are they different from each other?

You can get crisper edges with TrimDynamic. It’s a good brush for creating hard surface type models that look as though they’re made out of metal. Flatten produces a softer result.