Blender Techniques

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Scrape

• Under Layout, create a sphere, with add → Mesh → Ico Sphere. At the left bottom corner, set subdivisions to 4, and adjust radius.
• To flatten a surface, you can use Scrape under Sculpting.
• See the right hand side, adjust the brush, go to Advanced, tick Normal and Plane, untick Accumumlate. Falloff → Set to Sphere.

Collider from duplicate

• Press A to select the mesh, Shift+D right click to duplicate. Make sure your not in edit mode, but object mode.
• Add Modifier → Decimate → Reduce Ratio to 0.05. It allows less computation when dealing with collision. Tick Triangulate. Next to camera icon, use the down arrow to apply.
• Export FBX, Selected Objects only, Apply Transform.

Create n-sided shape

• Under Layout Object Mode, add mesh Circle.
• Click ~ to quickly adjust orthogonal view.
• Under Add Circle option at left bottom, adjust vertices to n. (5 in this case)
• Use Tab to switch to Edit Mode.
• Ctrl+R to subdivide each edge. Scroll up and down to increase and decrease the number of even subdivision.
• Click on these icons, to switch to either Vertex or Edge or Face.
• Shift + left click, to select multiple edges.

• Press X again and select what you want to delete. (Edges)
• Hit E key to expand, hit Y to lock expanding along y axis, press Ctrl and scroll to expand along grid points.
• Switch Face select mode, shift to select faces, press E to expand again. Press 1 to expand 1m.
• To position the object relative to center, not on top of the origin, knock it down half a meter via, press A to select the whole object, then adjust it using Transform.

Duplicate and Rotate Around

• Press the icon looks like a dart board. Set to 3D Cursor, this allows the rotation relative to the center of cursor.
• If you set the 3D cursor not at center accidentially, Shift+C to reset.

• Press A to select all objects.
• Press Shift+D to duplicate.
• Press R to rotate. Type any angle you want.

Select whole object

• You cannot just use select box to select the whole 3d objects.
• You can turn on the toggle X ray, by clicking the icon of two layers.

• Then drag the box to include the whole object.

Apply Rotation

• Under Object Mode, Ctrl+A and Rotation to apply Rotation.

Select Invert

• Select objects that are inverted to your select objects. Go Select → Ctrl+I.

Array Modifier

• Object Mode → Add → Plain Axes. This creates an empty object.
• Go to Transform, Z: 36 degrees.
• Go to Wrench icon, Add Modifier → Array → Uncheck Relative Offset #8594 Check Object Offset → Expand Object Offset → Drag Empty from Collection to Object under Object Offset → Increase Count.
• Apply.

Numberpad for orthogonal angle adjustment

• Front Orthographic - 1, Right Orthographic - 3, Top Orthographic -7.

Import reference images

• Adjust your view angle. 1 or 3 or 7
• Object Mode → Add → Image → Reference.
• Turn on Toggle X ray to view your cube transparent.
• Go to Image icon, tick Transparency, and adjust to 0.5.

• (Optional) Go to square with 4 extra corners icon, Viewport display and Show In Front tick.

Adjust level of face

• Switch to Toggle X-ray mode.
• Get to side view like 3.
• Click Tab to Edit Mode, Vertex select → Select box to select 4 corners which form the face → Click G and Lock Z → Click Left Mouse Key to finish.

Add Curvature via Cut

• Edit Mode → Point your mouse to one edge which will create a new perpendicular line to allow curvature adjustment.
• Ctrl+R, click left mouse key to start adjusting the line location.
• Select Vertex, G to drag up and down for leveling. Can use Z to lock along z-axis.

Adjust tangent angle of a face

• Toggle X-ray → Select vertices which form the target face → Press S and Lock Z → Type 0 to ensure flat.

Mirror work

• Under Edit Mode, Select one face by select box + Toggle X-ray + Vertex.
• Go to Transform, set x=0. This should remain half the body.
• Go to Face Mode, select the face and delete it.
• Go to wrench icon, add Modifier → Mirror. Continue your work without Apply.
• Apply when finished.
• It is important to note that, in Blender facing negative y-axis is normal. Since in Unity import, it will become different.

Create Face based on edges

• Select Edges which will form the face.
• Press F

A line cut

• Press K that starts the knife tool.
• Press C if you need a straight horizontal line. Press Space when finished.
• This is different from the loop cut Ctrl+R.

References

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