BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How can we produce 3D effects ?          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message HB Guest Posted: Wed Aug 31, 2005 2:27 am    Post subject: How can we produce 3D effects ? Hello, I have no knowledge about 3D and I also cannot completely switch to openGL or directX, but I need 3D only for special effects and simple objects. What is the best approach, I can see two different: a implementation with filters (feSpecularLighting) http://www.w3.org/TR/2002/CR-SVG11-20020430/filters.html or something like this: http://www.geocities.com/peter_bone_uk/engine3d.html What would you prefer, or some other method? Back to top Jens Gruschel Guest Posted: Wed Aug 31, 2005 8:34 am    Post subject: Re: How can we produce 3D effects ? Quote: a implementation with filters (feSpecularLighting) http://www.w3.org/TR/2002/CR-SVG11-20020430/filters.html This one works similar to the layer effects you know from Photoshop. You can give 2D layers a highlight and a shadow based on the transparency of the layer. To do such an effect basically you start with the alpha channel, duplicate it in a given color, blur it (Gaussian blur), move it by some pixels up/down/left/right, subtract the original alpha channel (for shadows which are under the original object), and apply it to the original layer using some blend mode. It can be done with Graphics32 easily. However you need a 2D source (bitmap with alpha channel) to use this approach. Quote: or something like this: http://www.geocities.com/peter_bone_uk/engine3d.html That's I think a real 3D engine using polygons to render 3D objects. You need a 3D source (model of an object) to use this approach. Quote: What would you prefer, or some other method? It very much depends on what you want to do. It's two completely different approaches used for different things. Jens -- Jens Gruschel http://www.pegtop.net Back to top Nils Haeck Guest Posted: Wed Aug 31, 2005 12:33 pm    Post subject: Re: How can we produce 3D effects ? W3C's svg filters define a chain of bitmap manipulation effects. You simply take a bitmap (RGBA) as input and produce one as output, and do that for each filter, resulting in the final result bitmap. All of this is of course 2D, it might look like 3D but really is just a visual trick. My component DtpDocuments already implements a few of these filters, like the blur/shadow. Feel free to test it for your needs, there's a free trial: http://www.simdesign.nl/dtpdocuments.html I'm working on a big update (codename "Pyro") which will implement most if not all of the svg filter effects. If you want to start from scratch, have a look at Graphics32. The other link points to a real 3D engine, with a 3D object being rendered through the viewing pipeline towards a flat plane. It's way more complicated to use that as a basis. Kind regards Nils Haeck www.simdesign.nl "HB" <nvalidHansBieland (AT) t-online (DOT) de> wrote Quote: Hello, I have no knowledge about 3D and I also cannot completely switch to openGL or directX, but I need 3D only for special effects and simple objects. What is the best approach, I can see two different: a implementation with filters (feSpecularLighting) http://www.w3.org/TR/2002/CR-SVG11-20020430/filters.html or something like this: http://www.geocities.com/peter_bone_uk/engine3d.html What would you prefer, or some other method? Back to top Francesco Savastano Guest Posted: Wed Aug 31, 2005 6:29 pm    Post subject: Re: How can we produce 3D effects ? Quote: or something like this: http://www.geocities.com/peter_bone_uk/engine3d.html That's I think a real 3D engine using polygons to render 3D objects. You need a 3D source (model of an object) to use this approach. Nice reference Jens, I wasn't aware of this code..:) Back to top HB Guest Posted: Thu Sep 01, 2005 12:03 am    Post subject: Re: How can we produce 3D effects ? Hello, could you upload a first demo of Pyro ? And how about offering extensions to g32, so that people don't need to switch completely from their existing code and it would be more affordable My application has already an own written engine (g32-compatible at lowlevel ), I would rather extend than change completely. Quote: I'm working on a big update (codename "Pyro") which will implement most if not all of the svg filter effects. If you want to start from scratch, have a look at Graphics32. The other link points to a real 3D engine, with a 3D object being rendered through the viewing pipeline towards a flat plane. It's way more complicated to use that as a basis. 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