_1024_PolygonMask

Hey thanks... out of curiosity, is this what we were talking about awhile back?

errrr, can't remember what we were talking about.... sorry. Can you remind me ?

Pinning the corner on buildings....but looking, I see that this probably isn't what you meant.

o i c. No, this is not what i meant. This is just to draw arbitrary convex masks on the fly using openGL, thus avoiding to make bitmaps. There's no texturing involved in that plugin, and the blending mode is always set to OVER, like a proper mask. I'm currently fighting at making concave polygons using the stencil buffer... ;(

We have an ultra-fast cornerpin plugin internally since a long time (that is perspective-correct, as opposed to all the QCtechniques you can find around), but I didn't make it public, b/c I have to keep some cards under my sleeve. It is actually being used in every mapping projects we do at 1024, from Boombox to the Tennis Mapping. I'll probably make it public when I'll finish some more advanced mapping plugins.

updated to handle convex and concave polygons

Fantastic, very generous of you Franz, thankyou. Could you please take a minute to clarify exactly what is meant by "perspective correct", I've seen it bandied about with ur plugs a lot and I'm not sure I totally understand the difference, after all, isn't all cornerpinning sort of altering the perspective?

Hello, I have a problem. I've downloaded the plugin from your blog. And I've placed the _1024_PolygonMask 1.1 onto the QC Plugins folder. But when I try to open the sample that cames in the zipped folder. I find myself with this message error

(null) : Patch with name "QCPlugInPatch:_1024_PolygonMaskPlugIn" is missing

Macro Patch Cannot create node of class "QCPlugInPatch" and identifier "_1024_PolygonMaskPlugIn"

Macro Patch Cannot create connection from ["outputQueue" @ "Queue_1"] to ["inputStructure" @ "PlugInPatch__1024_PolygonMaskPlugIn_1"]

(null) State restoration failed on

What am I missing? Can anybody help me please?

Forget my message. I've already solve it. It was really dummy. ahahah eu just erased the plugin from the plugin folder and pasted there again. And then it was working. :) Maybe I had a different version. I don't know. Great plugin, thanks. I wonder if it is possible to download the source code of it. So I can really understand how you do this, and try some stuff por myself. And then I can also publish here.

Thanks

I can't reproduce this problem, I downloaded the plugin patch, installed it to the Plug-Ins folder, opened up the example composition and the plugin patch works as would be expected.

Is the plugin actually in the right location or have you inadvertently dropped it outside of the folder?

I know I've managed to do that with one plugin or patch from time to time.

I wonder also if this is a message provoked by a 32 bit / 64 bit environment mismatch - just hazarding a guess here though.

Self help - the best help for oneself :-)

perspective correct means that the actual perspective is calculated, it's not the vertices that are moved.

hence perspective correct != quad warping

check http://en.wikipedia.org/wiki/Texture_mapping (while not related to my plugins, it will give an explanation)

This patch is really useful. :)

I wonder if it is possible to download the source code. Because I need something like this, but I want to save maks and load them after.

Cheers,

Hi Franz,

I see that you were fighting with the stencil buffer in 2010, and updated your plugin in 2012 to handle concave polygons :-) Can I ask how you managed to do it ? Thanks a lot if you can give me a tip on this.

As far as I remember I use a triangulation algo that can handle concave polygons. I think it was poly2tri or something similar. Anyway, it was lightweight.

Thanks ! I already implemented poly2tri, but I thought there was a GPU side way to do it.