From: Dirk Reiners <[EMAIL PROTECTED]> Reply-To: [email protected] To: [email protected] Subject: Re: [Opensg-users] MakeTransparentGraphOp Date: Fri, 15 Jun 2007 00:22:00 -0500 Hi Thomas, Thomas Weberndorfer wrote: >> >> Thomas Weberndorfer wrote: >>> Hello, >>> I have to make parts of a scenegraph transparent and use this code: >>> >>> MakeTransparentGraphOp *op = new MakeTransparentGraphOp; >>> std::ostringstream str; >>> str << "transparency=" << alpha; >>> op->setParams ( str.str().c_str() ); >>> op->traverse ( root ); >>> delete op; >>>>>> But this results always in semi-transparent objects with an alpha-value>> of>>> 0.5f. I tested this code with alpha-values form 1 to 0, but i get always>> the >>> same output. Is that problem still current or did you find the problem? Dirk
Hello,Yes, the problem still exists. I want to change the transparency of a loaded model. For testing, I use the tie.wrl file. This is the method for changing the transparency:
void setTransparency ( float alpha )
{
MakeTransparentGraphOp *op = new MakeTransparentGraphOp;
std::ostringstream str;
str << "transparency=" << alpha;
op->setParams ( str.str() );
// the root node contains a Group-core and has the model attached
op->traverse ( root );
delete op;
}
But this method seems to ignore the alpha-parameter, because the result is
always the same. (Even alpha = 0 and alpha = 1 produces the same result. I
attached the results.)
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<<attachment: LoadedModel.png>>
<<attachment: LoadedModelAlphaIs0.png>>
<<attachment: LoadedModelAlphaIs1.png>>
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