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QUESTION
I'm trying to run a query in Firebase to get the value of an specific field in the USERS collection and I don't understand why .documents it's an Unresolved Reference. Any ideas?
...ANSWER
Answered 2020-Apr-23 at 01:38It's because snapshot
is a DocumentSnapshot, and as you can see from the linked API documentation, it doesn't have a method called getDocuments()
on it.
When you call get()
on a DocumentReference as you are now, you get a single document as a DocumentSnapshot. You do not get a QuerySnapshot like you do with queries that could return multiple documents. You are probably confusing the two.
QUESTION
I've been drawing Cornell box. I want to place light in my lamp(lamp is a white cube placed on the right wall). It will make an illusion that lamp is shining. But I can't place my light into the cube. I have tried to Set the view transform and then set light position, but it doesn't work.
Here is my simple code: ( lamp cube has been moved glTranslatef(0.63, 0.3, 0.0)
)
ANSWER
Answered 2018-Nov-03 at 09:19Note, that drawing by glBegin
/glEnd
sequences, the fixed function pipeline matrix stack and fixed function pipeline per vertex light model, is deprecated since decades.
Read about Fixed Function Pipeline and see Vertex Specification and Shader for a state of the art way of rendering.
Anyway, when the light position is set by glLightfv(GL_LIGHT0, GL_POSITION, pos)
, then
pos
is multiplied by the current model view matrix.
This means if the position is set before the model view matrix is set, then the light position is placed in absolut coordinates to the world.
If it is set after the model view matrix was set, then the light position can be set in the coordinate system of the model.
Set the light position when you draw the lamp, to the center of the "lamp":
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