Using QGLTwoSidedMaterial vs QGLMaterial

[quantumavatar]

So using QGLMaterial is pretty straight forward. This works fine for me:

@
QGeometryData plot1;
QGLSceneNode *node1 = builder.newNode();

QVector3D a1( 0,  0,   0 ); plot1.appendVertex(a1);
...
QVector3D h1( 3,  1.5, 0 ); plot1.appendVertex(h1);
builder.addQuadStrip(plot1);

QGLMaterial *mat1 = new QGLMaterial;
mat1->setColor(Qt::green);
node1->setMaterial(mat1);
node1->setEffect(QGL::LitMaterial);@

However I have not seen any tutorials or examples of using two sided material so I tried this:

@ QGLMaterial *mat1 = new QGLMaterial;
mat1->setColor(Qt::green);

QGLTwoSidedMaterial *ts = new QGLTwoSidedMaterial;
ts->setFront(mat1);
ts->setBack(mat1);

node1->setMaterial(ts);
node1->setEffect(QGL::LitMaterial);@

but I get an error

@error: no matching function for call to 'QGLSceneNode::setMaterial(QGLTwoSidedMaterial*&)'@

How exactly do you utilize the two sided material? I dont see it used in the Qt3D examples or the API page.

You guys rock!

Long Live Qt!

[tonyorourke]

Had the same problem. Solved it by binding the material to the painter in the node's draw(QGLPainter *painter) routine. Try this -

ts->bind(painter);
.... (other code) ...
ts->release(painter, 0);

QGLTwoSidedMaterial is derived from QGLAbstractMaterial, not from QGLMaterial, so setMaterial(ts) won't work.

Hope this helps.