Blender

Avoid common Blender mistakes — transform application, modifier order, UV seams, and export settings for game engines.

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Last updated: April 29, 2026

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Manual Installation

No automatic installation available. Please visit the source repository for installation instructions.

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Transforms

Apply scale before export —
```
Ctrl+A
```
→ Scale, or objects deform in game engines
Apply rotation for correct orientation — especially for rigged models
Non-uniform scale breaks modifiers — apply scale before Mirror, Bevel, etc.
Reset transforms:
```
Alt+G/R/S
```
— location, rotation, scale to defaults

Object vs Edit Mode

Object mode transforms affect whole object — Edit mode transforms geometry only
Modifiers applied in Object mode — Edit mode shows base mesh
Selection works differently — Object selects whole, Edit selects vertices/edges/faces
```
Tab
```
to toggle — most operations mode-specific

Normals

Flipped normals = invisible faces —
```
Shift+N
```
to recalculate outside
Check in Viewport Overlays → Face Orientation — blue is correct, red is flipped
```
Ctrl+Shift+N
```
for flip inside — useful for interior scenes
Smooth shading issues = bad normals — recalculate first

Modifiers

Order matters — Mirror before Subdivision, Bevel before Mirror typically
Apply modifiers for export — game engines don't understand Blender modifiers
Array + Curve = deformation issues — apply Array first, then Curve
Subdivision preview vs render levels — set same for consistent export

UV Unwrapping

Mark seams where texture can split —
```
Ctrl+E
```
→ Mark Seam
Seams at hidden areas — under arms, behind ears, model edges
```
U
```
→ Unwrap after marking — Smart UV Project as fallback
Check UV overlap — causes baking issues, separate islands

Origin Point

Origin affects rotation/scale pivot —
```
Right-click
```
→ Set Origin
Origin to geometry for centered pivot — Origin to 3D Cursor for precise placement
Origin matters for game engine import — often should be at feet/base

Export for Game Engines

FBX or glTF for Unity/Unreal — glTF for web
Apply transforms on export — "Apply Scalings: FBX All" for Unity
Forward axis:
```
-Z Forward
```
, Up:
```
Y Up
```
for Unity — different for Unreal
Embed textures or pack separately — depends on workflow

Python API (bpy)

```
bpy.context
```
is current state — selection, active object, mode
```
bpy.data
```
is all data — access any object by name regardless of selection
```
bpy.ops
```
are operators — require correct context (mode, selection)

Override context for operators —

{'object': obj, 'selected_objects': [obj]}

Most ops need Object mode —
```
bpy.ops.object.mode_set(mode='OBJECT')
```
first

Common Mistakes

Duplicate with Alt+D creates linked copy — changes affect both, use Shift+D for independent
Delete vs Dissolve — Delete removes geometry, Dissolve merges (Edit mode)
Proportional editing left on — affects unexpected vertices, check header
Subdivision on high-poly crashes — start with Levels: 1, increase gradually
Materials not linked to object — won't export, must be assigned to faces

Blender

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Quick Start

Manual Installation

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Transforms

Object vs Edit Mode

Normals

Modifiers

UV Unwrapping

Origin Point

Export for Game Engines

Python API (bpy)

Common Mistakes

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