Hello,
I am trying a get quite a simple issue done using the SwitchPtr.
Instead of dumping the whole source-code here i think it would be better to
explain the thing that i want to do.
I want to load an object using one of the loader built-in within the system,
attach different shader to it and render it using the Switch by selecting
different
shader with keyboard event.
Sound quite simple though, things get complicated if i want to refer to the
same
geometry and render it with different shader and select the particular
shader to be
loaded on the screen using the Switch.
1. I am loading a teapot with the loader and attached a shader to it. STATUS
- SUCCESS.
2. I am creating a new node referring to the same geometry that i have
loaded in step 1 and attached another
shader to that one.
3. Then i have created a Switch as follows:
//crate a node with a switch core
SwitchPtr sw = Switch::create();
beginEditCP(sw, Switch::ChoiceFieldMask);
/*the first choice is set to mode
that will be changed with the
key-press event
mode is a static ineger value
that gets updated with the key-press event
*/
sw->setChoice(mode);
endEditCP(sw, Switch::ChoiceFieldMask);
/*
Create a Node to hold the switch core
*/
NodePtr switchNode = Node::create();
beginEditCP(switchNode);
switchNode->setCore(sw);
switchNode->addChild(utah_teapot1);
switchNode->addChild(utah_teapot2);
endEditCP(switchNode);
4. And finally i am attaching the node created at step 3 to the root node
as children.
5. In the keyboard event i have the following code:
switch(k)
{
case 27:
{
OSG::osgExit();
exit(0);
}
break;
case 't': mode = 1; break;
case 'p': mode = 2; break;
}
The matter of fact is that i am loading all the shaders initially while
creating the scene graph,
I just want switch between different shaders with keyboard event.
But i get a blank screen.!!!!!!, even with the keyboard event.
With single shader shader and without Switch i can load the shader and
render on the screen.
Please let me know if any one of you need more information to get around
that issue.
Cheers
Sajjad
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