Create a 'simple' yet 'detailed' Boolean Mesh. You should have at least 3 independent meshes that plug in like a Lego. Male sure you use Union and Difference. You can use other tools, but the main tool should be Booleans.
Tools you may need.
Extrude (Face): Select the faces you want to extrude and then Edit Mesh > Extrude NOTES
Selecting Multiple Faces: Hold {Shift} and select multiple faces at one time
Insert Edge Loop: Mesh Tools > Insert Edge Loop NOTES
Extract (Faces): Select the faces you want to extract and then Edit Mesh > Extract NOTES
Smooth: Mesh > Smooth NOTES
Offset Edge Loop: Mesh Tools > Offset Edge Loop NOTES
Fill Hole: Mesh > Fill Hole NOTES
Multi-Cut: Mesh Tools > Multi-Cut NOTES
Delete Edge: Edit Mesh > Delete Edge/Vertex or {CTRL} + {DEL} *If you only hit delete it will only delete the edge not the vertices.
Mesh > Booleans > Union
It should look something like this.
Then Delete History by
clicking shortcut above
OR
Edit > Delete by Type > History
OR
{ALT} + {Shift} + {D}
Mesh > Booleans > Difference
It should look something like this.
Delete History by
clicking shortcut above
OR
Edit > Delete by Type > History
OR
{ALT} + {Shift} + {D}
Create 3-4 simple but detailed Boolean objects. Design in a way that they fit like Lego parts.
First Remesh the polygon. Mesh > Remesh □ (Use the Option box)
Switch to Custom and change the Collapse threshold to 10%
*I set this to 10% because in Automatic mode, I lost too much detail.
*If the material gets disconnected and turns green, just reapply the StandardSurface1.
It should look like this. *Make sure you have not lost any detail.
Now Retopologize the geometry and open the Options. Mesh > Retopologize □ (Use the Option box)
Uncheck Preprocess Mesh
For this mesh, I set Target Face Count to 5000
Check Edges by Angle and Set to 30 - This preserves and edge that has 30 degrees or more.
Check Symmetry only if your model is symmetric
And determine what axis you have symmetry
*Check Symmetry ONLY if your model is symmetric
And determine what axis you have symmetry
This is how mine mesh looked like.
Repeat for all the parts in the scene.
First Remesh the polygon. Mesh > Remesh □ (Use the Option box) This mesh has a lot of small detail, so I ended up changing the Collapse Threshold to 5%
Look at each object closely to make sure you did not loose any details before you Retopologize.
I changed the Collapse Threshold to 5%
Now Retopologize the geometry and open the Options. Mesh > Retopologize □ (Use the Option box)
Uncheck Preprocess Mesh
For this mesh, I set Target Face Count to 300 because there are fewer faces.
Check Edges by Angle and Set to 30 - This preserves and edge that has 30 degrees or more.
*Check Symmetry only if your model is symmetric
And determine what axis you have symmetry with this mesh, I changed the symmetry to +Z to -Z
This is how my mesh looked like.
First Remesh the polygon. Mesh > Remesh □ (Use the Option box) This mesh has medium sized details, so I ended up changing the Collapse Threshold to 10%
Look at each object closely to make sure you did not loose any details before you Retopologize.
Retopologize the mesh and open the Options. Mesh > Retopologize □ (Use the Option box)
Uncheck Preprocess Mesh
For this mesh, I set Target Face Count to 2000 because it is a simple mesh and the details are medium sized.
Check Edges by Angle and Set to 30 - This preserves and edge that has 30 degrees or more.
*Check Symmetry only if your model is symmetric
And determine what axis you have symmetry with this mesh, I changed the symmetry to +X to -X
First Remesh the polygon. Mesh > Remesh □ (Use the Option box) This mesh has small sized details but uniform, so I ended up changing the Collapse Threshold to 10%
Look at each object closely to make sure you did not loose any details before you Retopologize.
Retopologize the mesh and open the Options. Mesh > Retopologize □ (Use the Option box)
Uncheck Preprocess Mesh
For this mesh, I set Target Face Count to 500 because it is a simple mesh and the details are medium sized.
Check Edges by Angle and Set to 30 - This preserves and edge that has 30 degrees or more.
*Check Symmetry only if your model is symmetric
And determine what axis you have symmetry with this mesh. In this case it could be across X or Z; I changed the symmetry to +X to -X
Now put all the parts back in place.
Put all the parts back into place. AND press {3} on the keyboard for a smooth preview. Like this . . .
Final Render; use image based light and change the material to something 'cool'.