1) Orthographic camera example, 2) Default camera too close, and 3) Custom camera disrupts zooming and rotation

[mohamed82008]

This is multiple issues related to each other so sorry about that. If you want I can split them. I am trying to make a custom orthographic view to include the whole mesh in the window. The default _view makes the camera too close. When I dug into the examples, I found a way to make a PerspectiveCamera but not an OrthographicCamera. I believe both of these are in GLAbstraction in which I couldn't find usage examples also. Also when I made a custom PerspectiveCamera, it worked but the zoom and rotation stopped working, so is there a way to fix that? I am on Windows and v0.6.1 btw.

[SimonDanisch]

OrthographicCamera is kind of deprecated, since PerspectiveCamera can change the projection to orthographic. just do:

w = glscreen(); @async renderloop(w)
_view(visualize(rand(Float32, 32, 32)))
cam = w.cameras[:perspective]
push!(cam.projectiontype, GLAbstraction.ORTHOGRAPHIC)
GLAbstraction.center!(w) # center to all objects in scene

Note that you might need to set the position/lookat field as well, since center changes those at the moment...

[mohamed82008]

Great, works with a reshuffle of lines!

isdefined(:window) && destroy!(window)
window = glscreen()
@async renderloop(window)
all_render_objects = RenderObject[]

s = 1
n = 10
rectangles = vec([(HyperRectangle{3,Float32}(Vec3f0((i-1)*s, (j-1)*s, (k-1)*s), Vec3f0(i*s, j*s, k*s)), 
                        RGBA(0.5f0,0.5f0,0.5f0,1f0)) for i in 1:n, j in 1:n, k in 1:n]);
meshes = map(GLNormalMesh, rectangles);
colored_mesh = GeometryTypes.merge(meshes);

robjs = extract_renderable(visualize(colored_mesh))
_view(robjs, window)
append!(all_render_objects, robjs);

cam = window.cameras[:perspective]
push!(cam.projectiontype, GLAbstraction.ORTHOGRAPHIC)
GLAbstraction.center!(window)

The window.cameras[:perspective] is not defined before running _view. Also for some reason, when I was making the camera object and assigning window.cameras[:perspective] = cam explicitly, it was not working as expected. Anyways, I am glad I found a workflow, thank you!

[mohamed82008]

Is there anything that refreshes the camera? I try changing the camera attributes but it is not updating.

[SimonDanisch]

you might need a yield() to allow the event loop to update the values... the camera gets added to the renderobject when calling _view, so changing window.camera after _view wont affect the objects

[mohamed82008]

That's what I am trying with no luck.

_eye = Vec3f0(2n,2n,2n); eyeposition = Signal(_eye)
_lookat = Vec3f0(n,n,n); lookatposition = Signal(_lookat)
_up = Vec3f0(_lookat[1]-_eye[1], _lookat[1]-_eye[1], 2*_eye[1]-2*_lookat[1])
upvector = Signal(_up)

cam.eyeposition = eyeposition
cam.lookat = lookatposition
cam.up = upvector
cam.nearclip = Signal(0f0)

yield()

[SimonDanisch]

ah, you need to push the attributes to the signal! so do push!(cam.nearclip, 0.0)

[mohamed82008]

Great, works now, even without yield! Thanks a lot!