Blender Meta objects are implicit surfaces, meaning that they are not explicitly defined by vertices (as meshes are) or control points (as surfaces are): they exist procedurally. Meta objects are literally mathematical formulas that are calculated on-the-fly by Blender.

edge[edit]

Sharp flag is used by the split normals and the Edge Split modifier, which are part of the smoothing/customized shading... Crease...value between (0.0 to 1.0), is used by the Subdivision Surface Modifier to control the sharpness... Edge Slide...selection must define a valid loop

Retopology

• Edge Split, a hole will be created
• Edge Loops connects multiple edge loops with faces

surface generation[edit]

Grid Fill... best predictable result can be achieved if you select two opposite edge loops with an equal number of vertices. When a single, closed edge loop is selected, the Span/Offset options allows you to adjust the way two opposite edge loops are detected

bsurfaces addon[edit]

The Bsurfaces addon, build in Blender 2.8, creates mesh from annotation strokes... Meaning that you can use the Bsurfaces addon create meshes or use it for retopology.

we work on the same mesh object we want to build

using the curve

sculpting[edit]

Retopology

In order for sculpting to give accurate and predictable results, Blender needs geometry to work with. One way to accomplish this is starting off with a highly subdivided mesh. The other way involves using either of two adaptive sculpting methods to add geometry dynamically... The Multiresolution Modifier can be used to dynamically subdivide the mesh.

Dynamic Topology[edit]

Dynamic topology (aka dyntopo) is a dynamic tessellation sculpting method, adds and removes details on-the-fly, whereas regular sculpting only affects the shape of a mesh.

Unwrap[edit]

seam is where the ends of the image/cloth are sewn together. In unwrapping, the mesh is unwrapped at the seams. Think of this method as peeling an orange