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In the following videos recorded live on Twitch (videos may include off-topic chat and other discussion not related to the subject at hand), watch how jazzKat shows us the process of making a very simple gift box accessory items for IMVU. Beginner friendly.
The main way to manipulate the 3D View in Blender is using the MIDDLE mouse button (MMB); click hold and dragging the mouse ROTATES the entire scene; SHIFT + click hold dragging MMB will TRANSLATE, strafes or moves the Scene LATERALLY (up/down, left/right); CTRL + click hold dragging MMB will ZOOM the Scene.
When wanting to select various things in Blender; LEFT click (left mouse button - LMB) tends to be for selecting, adjusting, changing properties, options and settings; RIGHT click for selecting objects and user generated data.
To learn more about using Blender try this exercise, "An Introduction to Blender for IMVU Creators" (PDF available).
The videos below walk through the process of making a very simple accessory gift box in Blender that's textured, positioned and then exported to FBX for import and assembly in IMVU.
Design note: if objects don't appear where they should in the product Editor re-export and disable "Selected Objects" in export settings forcing Blender to parse the entire scene, unwanted items can then be deselected on import to IMVU.
Steps summary
Design note: * as the default Cube has a pre-assigned Material the object was deleted to better reflect what is more likely going to be the case; a mesh being added to the scene without Materials, requiring their generation.