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.