Shadow bug with ITextScenenodes???

[sdi2000]

Hi there,

i try to use an IAnimatedSceneNode with shadows and a ITextSceneNode at the same time. If the ITextSceneNode is visible the shadow was not drawn. but why?
To replicate this bug add some few code lines to the example project "SpecialFX" like this:

Code: Select all

//at first include the std string for a better string handling =)
#include <string>


//add the following code after room loading routine

node = smgr->addEmptySceneNode();
std::string l_tmp = "hello, this is a test!";
std::wstring l_tmpw;
for(size_t idx = 0; idx < l_tmp.size(); ++idx)
{
	l_tmpw += l_tmp[idx];
}
scene::ITextSceneNode *l_text = smgr->addTextSceneNode(gui->getBuiltInFont(), l_tmpw.c_str(), video::SColor(1,250,250,250), node);

now try it. If the textnode is visible, we could not see any shadows, but if the textnode is outside of the viewport the shadow was draw. ?!
a strange bug =)

has anyone a solution for this problem??

cya
oli



an addition:

in the function "createShadowVolume" from class "CShadowVolumeSceneNode"
is a small bug. To prevent an access violation switch all "IndexCount *5" to "IndexCount*6" because in the bottom part of this function we fill the arrays "svp->vertices" with 6 elements not with 5 =)

cya...

[niko]

Thanks for posing. Looks like some render states get ~destroyed~ when switching to 2d text mode for the text rendering. I'll have a look into it.

[Snake]

I have another problem: when I make a text visibile, the shadowmaps get different!!! I think it's related to the same problem... a fix would be great, cos it's quite irritating!

[MattyBoy]

Does anyone have a fix for the first problem mentioned in this thread?

If I change the PreRendering code in CTextSceneNode from

SceneManager->registerNodeForRendering(this, ESNRP_SHADOW);

TO

SceneManager->registerNodeForRendering(this, ESNRP_TRANSPARENT);

It now doesn't mess with the shadows, but the GUI skin gets messed up. The buttons sometimes loose their gradient coloring.

[playerdark]

I am having a similar problem. Although my original code worked with shadow and the GUI, I switched to shaders mostly. However I did not manage to get the shadow node to have it's own shader becasue it does not have a material.

Now, the shadow is completely distorted, and the GUI seems to be a childnode of one of my scenenodes. It jsut moves with the scenenode and is influenced by it's object space.

I know that shaders aren't a priority, but there seems to be a general problem with the GUI and the shadow that doesn't quite decouple the GUI from what was done beofre it was rendered. Not shure how I can explain this any better

[bitplane]

i guess this is something to do with render states being changed to 2d mode to draw the textscenenode. It can't be good to continually change the projection matrix for drawing 2d stuff in the middle of 3d draw calls.
I think I'll remove the old text scene node completely, and update Tom's billboard text node to work with the new fonts.
edit: I ditched this idea, the reason being billboard text nodes can only work with IGUISpriteBitmap fonts, not generic IGUIFont.