By making all the parts and putting them together.
You need to be more specific with that sort of question. I suppose, given the question you want to know how to learn 3d modelling. You know Blender? Best to start there, it’s popular and free with plenty of tutorials available.
Blender3D objects used as trees / detail in Unity3D terrain (See the second half of this response)
Probuilder and Probuilderize and Blender:
Some more potentially-useful info:
Updating Blender files without breaking your prefabs:
When I work in Blender3D for Unity3D use, I follow these organizational rules:
use Empty Blender Objects as folders: they come out as an extra GameObject
ALWAYS parent everything to a single Empty, even a single object
ALWAYS apply all Scales and Rotations on every Transform throughout your hierarchy.
put as few objects in a given .blend file as possible, combining them in Unity into a prefab
REMOVE unnecessary items (Light, Camera, etc.)
use good names for your Blender3D objects and NEVER RENAME them after Unity sees them
don’t even think about final Materials or Textures in Blender. Set the mesh to use N different materials, but always set up the materials within Unity and disregard what gets imported.
No, I meant like, when I try to make a stadium, i think there all together until I look at a different angle and realise it’s miles of target and then why I try to fix it, the main camera disappears and I have to start again and it keeps on going like that.
I think your first post was already kinda vague. This has me even more confused what you’re actually asking here. Do you have issues navigating the Unity editor scene view? I’m kinda lost here
Perhaps the mesh, if it’s a full stadium, doesn’t have its mesh bounds set up correctly so if the camera no longer has the mesh’s origin in its view frustum, the whole thing gets culled even though it visually extends.
Check that this property has a correct size and isn’t all zeros. It’s also visible in Inspector if you select the mesh itself.