CODEWITHSUNDEEP
c++qtopenglqtguiqvector3d
tintin
tintin

Reputation: 1519

Draw points in OpenGL with QVector3D

I have a list of QVector3D, which is a list of points, I want to draw a list of points with glDrawArrays.

initializeGLFunctions();

glGenBuffers(2, vbo);
//the vertices 
QVector3D *vertices = &data[0];

glBindBuffer(GL_ARRAY_BUFFER, vbo[0]);
glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(QVector3D), vertices, GL_STATIC_DRAW);

glDrawArrays(GL_POINTS,??);

or what other method I can use to deal with this?

Upvotes: 2

Views: 2570

Answers (1)

László Papp
László Papp

Reputation: 53173

glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(QVector3D), vertices, GL_STATIC_DRAW);

This is correct, but I would suggest to use more intelligent containers like QVector outside an then constData as follows:

glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(QVector3D), myVector.constData(), GL_STATIC_DRAW);

Here is another official example how to use glBufferData in the context of QVector3D:

geometryengine.cpp Example File

Here can you find another third-party example following the official example:

FabScan100

Then, you could write:

glDrawArrays(GL_POINTS, 0, data.size());

Upvotes: 3

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