Light rotation to normalized vector?

[shadmar]

If I want the sunlights rotation converted into a direction vector, how can I do this in lua?

[AggrorJorn]

Something like this I believe:

entity:GetQuaternion() * Vec3(0,0,1)

 

*Edit

Unless the GetQuaternion is not exposed in lua.

Edited July 24, 2014 by Aggror

[Charrua]

i used this to use an entity rotation and transform it to a normalized rotation, perhaps is very indirect, but seems to work

 

guess there should be a simpler mathematical way, but still unknown for me.

 

hope that helps:

 

if self.usepivotpin then
local pvtTemp = Pivot:Create()
--get ent rotation, to set hinge pin
if pvtTemp ~= nil then
pvtTemp:SetRotation(self.entity:GetRotation())
pvtTemp:Move(0,0,1) --transform from euler angles to 0..1 axis coords ... a vector of lenght one: nomarized
local rot = pvtTemp:GetPosition(false)
self.pin.x = rot.x
self.pin.y = rot.y
self.pin.z = rot.z
--System:Print("pin: " .. self.pin.x .. ", " .. self.pin.y .. ", " .. self.pin.z)
pvtTemp:Release()
end
end

 

i used to set hinge joint pin, btw

[shadmar]

Thanks both.

 

virtual Quat GetQuaternion(const bool global=false);//lua

 

seem exposed in the header, I will test.

[shadmar]

Attributes (x,y,z,w) are not exposed in the Quat class.

[AggrorJorn]

So it returns the quat but without having acces to xyzw. I honestly dont know how to do it without de quaternion.

[macklebee]

what does the uniform 'lightdirection' in the directionallight shader return?

[Josh]

Transform:Vector(0,0,1,light,nil)

 

And to go the other way:

 

Entity::AlignToVector():

http://www.leadwerks.com/werkspace/page/documentation/_/command-reference/entity/entityaligntovector-r166

 

All the heavy math has been worked out for you, including alignment along any axis, an optional roll value, and gradual interpolation.

 

OR

 

You can just access the third row of the 4x4 matrix directly:

 

dir = Vec3(light.mat.k.x,light.mat.k.y,light.mat.k.z):Normalize()

[shadmar]

Thanks!

 

dir = Vec3(light.mat.k.x,light.mat.k.y,light.mat.k.z):Normalize()

 

is accurate and just what was needed!

[shadmar]

It works : http://steamcommunity.com/sharedfiles/filedetails/?id=291076598