Lighting in Unity - Emissive light

https://www.youtube.com/watch?v=VnG2gOKV9dw&feature=emb_logo

Create a cube in Maya. Scale. Select. Mesh Display. Click reverse. Click in viewport. Model becomes black. Display>Polygons>Backface culling
https://www.youtube.com/watch?v=nX_iasG6smg&feature=emb_logo
Maya>create cube>File>Send to Unity
Position and scale - use hatch with magnet snap symbol, in toolbar under scene, to position and snap to the grid
Import stock asset - in this case a mug

to be continued....

Position the camera so it looks into the scene
Remove the default directional light, as this is to be an indoor scene
We can either create lights, or we can create an object with an emissive material
Right click and create plane
Turn off light (lightbulb underneath scene tab) so we can see what we're doing
Set scale of plane to X 0.2 Y 1 Z 0.2
Right click on the word Transform (blue) in the inspector>reset position
Rotate -90 on the Z axis
Position slightly away from the cube wall
Create new material - rename 'orange light'
Drag material onto plane. Select material>inspector>emission>enable>click HDR eyedropper to select colour. Set emission (in colour wheel window - for Unity 2019.4.8f1) set to 1.5
Nothing really happens. Even if we turn on the lighting (lightbulb icon) then nothing particularly happens.
To do this we need to bake a light map
Objects need to be static
Select cube, mug and plane - inspector>enable static (top right corner)
Nothing happened. I'd not got Auto-Generate lighting on. I clicked on the Auto Generate Lighting at the bottom of the screen and the lighting menu popped up. Enabled autogenerate and the light map was baked. Image below

Rename plane 'orange light' and duplicate
remove the negative '-' in the X position to flip it across to the opposite wall
Change Y rotation to 180
Duplicate material and rename blue light

It still doesn't look too good. That's because imported models may not have LightMap UVs. To do this, select the model in the project window to view the model/rig/animation/materials tabs. Enable Generate Lightmap UVs for the cube and the mug. This means Unity will automatically calculate the lightmap UVs
If seams are still visible select object>inspector>Lightmapping>Stich Seams

The mug still had seams showing and a warning came up about overlapping UVs. If I haven't created models with Light map UVs there may be a problem with overlap and dark lines showing (known as artifacts). This essentially means that the charts are overlapping on the map. To correct this the pack margin can be increased. Follow this link to rectify https://docs.unity3d.com/Manual/ProgressiveLightmapper-UVOverlap.html

Image below showing the UV light map, pack margins set at 3.

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