I am working with a test scene and all the texture are baked and I am using model for the whole scene, so no need for any light source except an ambient light to cast "ambient" on all model.
However, after build, my scene is total black because there are no light to light up the scene
So, how could I add only an ambient light to my scene, I see that the light inside 3DGS is a point light only

Some example
The in-game screenshot

And
Ambient light only (what I want)

No one could help me
I really can not find a way to set only ambient light in A6

What about setting the sun_light (which is directional) but using a special material for the model, which makes it non-sensitive for the sun_lights direction?

For a quick test:

A model usually gets the default material: mat_model

You can try the following instruction (also in-game):

vec_set (mat_model.diffuse_blue, vector(0,0,0));

This should remove the bright spots, while leaving the ambient intact.
If it works you could simply define a new material with the diffuse component set to zero.

I have not tested but this method does not fit me. I have hundred object in scene and set material action for permodel is a huge and dull task..

isn't there something as mat_model which applies for every model in the current level?

also try using the unlit flag if there are static lights around that might be messing it up...

I never think this will be a big problem in A6

Spend all day for searching a method, but fail... too bad

Ok, have another idea. In your script, call these [once] after the level has been loaded.

var fullvector[3] = 255, 255, 255;
vec_set(mat_model.diffuse_blue, fullvector);
vec_set(mat_model.ambient_blue, fullvector);
vec_set(mat_model.specular_blue, nullvector);
vec_set(mat_model.emissive_blue, nullvector);
mat_model.albedo = -100;


This should remove sun lighting. Also try setting sun_light = 0;