ofMesh:addVertex() not working with ofVec3f

[grabanton]

Hi! I am trying create ofMesh object and fill it with vertices.

I am writing in onSetup section:

mesh = ofMesh();
mesh:setMode(OF_PRIMITIVE_LINES);

In ofUpdate section:

mesh:clear()
mesh:addVertex(ofVec3f(0,0,0));

And I got this error:

- ofelia: [string "package.preload['__.x2687c30.c'] = nil packag..."]:4: Error in Mesh_addVertex (arg 2), expected 'ofDefaultNormalType *|ofDefaultVertexType *|glm::vec3 *' got 'ofPoint *|ofVec3f *'

also if I try writing:

mesh:addColor(ofColor(255));

error:

- ofelia: [string "package.preload['__.x2687610.c'] = nil packag..."]:4: Error in Mesh_addColor (arg 2), expected 'ofDefaultColorType *|ofColor_< float > *|ofFloatColor *' got 'ofColor_< unsigned char > *|ofColor *'

It say what I give wrong type of argument, but I do as in the openFrameworks documentation.

[cuinjune]

Hi, you should convert ofVec3f() to glm::vec3() by appending :vec3() to ofVec3f() as it says here: https://github.com/danomatika/ofxLua#glm

So your code should be

mesh:addVertex(ofVec3f(0,0,0):vec3());

[grabanton]

@cuinjune, thank you! It works for addVertex, but what about color? How to convert ofColor_< unsigned char > to *|ofColor_< float >? And is there an approach to get a list of all methods of an object?

[cuinjune]

mesh:addColor() accepts ofFloatColor() instead of ofColor() which uses float r,g,b values between 0 and 1.

You can check the ofelia/examples/3d/coloredCube example to see how it can be used.

[grabanton]

Where I can find information about mathematical operations with glm objects? When I try call any methods of glm::vec3() I got errors:

- ofelia: [string "package.preload['__.x25eb0c0.c'] = nil packag..."]:4: attempt to index a userdata value (local 'v')

I mean acces to vector components or length(), distance(), dot(), cross() etc...

UPD:
Found approch to doing it. I need wrap glm::vec3 back to ofVec3f type. And there available all needed methods.
like in this example:

local v1 = ofVec3f(mesh:getVertex(0));
local v2 = ofVec3f(mesh:getVertex(1));
print(v1:distance(v2));

But still actual question about getting list of object methods )

[cuinjune]

You can access all the methods through ofVec3f() variable before converting it to glm::vec3().

So I'd suggest always define variables in ofVec3f() type and only covert them to glm::vec3() when needed.

Like the following example:

ofelia f;
local v = ofVec3f(3, 4, 1);
print(v:length());
local mesh = ofMesh();
mesh:addVertex(v:vec3());
local v2 = ofVec3f(mesh:getVertex(0));
print(v2:length());

I don't think it is currently possible to directly initialize glm::vec3() by doing something like local v = glm.vec3(0, 0, 0) in Ofelia. This could be a bug or recently supported feature of ofxLua. I will try to update ofxLua used in Ofelia soon and see if glm can be used directly.

[grabanton]

@cuinjune, thank you very much! I have a number of questions and suggestions on how to improve the ofelia. Can we chat in person on Facebook or Telegram so as not to clog up the thread?
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