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Descrizione
Environment
- OS Version: Ubuntu 18.04
- Source or binary build? both - all versions
Description
The transparency result is different between Ignition ColladaLoader and threejs's CollaLoader if <transparency> tag is present, and <transparent> tag is missing, e.g. the follow tag produces an opaque mesh in Ignition but a transparent mesh in threejs:
<transparency>
<float sid="transparency">0.000000</float>
</transparency>
Looking at the collada spec (pdf) spec, the default mode should be A_ONE. The current code sets transparency in the following way:
dstFactor = 1.0 - color.A() * transparency;
srcFactor = color.A() * transparency;
_mat->SetTransparency(dstFactor);
This should produce a transparency value of 1.0 which means fully transparent.
Other notes
_mat->SetTransparency(dstFactor); is a bit confusing since srcFactor is the one that corresponds to the object's material opacity. However, the math works out to be correct because:
transparency = 1.0 - opacity
= 1.0 - srcFactor
= dstFactor