Variance Shadow Mapping

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Re: Variance Shadow Mapping [Re: mpdeveloper_B] #178212 01/17/08 17:18 01/17/08 17:18
Joined: May 2005 Posts: 2,713 L�beck Slin OP Expert
Slin OP Expert Joined: May 2005 Posts: 2,713 L�beck	There are three views at the suns position facing the camera with different arc values. Each of them renders a depthmap. There is an other view placed at the same position as camera having always the same parameters. The objects in this view are rendered with a shader which compares their "real" distance to the light for each pixel using always the depthmap with the highest resolution possible for it. If the "real" depth is bigger than the one safed in the depthmap, it is a shadow and is rendered in a dark grey otherwise it is rendered white. This is then combined per postprocessing with the image rendered by the camera and then displayed. This is basicly how it works. I also blur the shadowmap which has the smallest arc to get softer shadows near to the camera. This is all combined with keeping the square of the depth in the depthmaps which is used for the variance part... That is basicly how it works. It could also be done with A6 comm and render to texture. Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en) Shader Tutorial (ger) http://www.slindev.com

Re: Variance Shadow Mapping [Re: Slin] #178213 01/17/08 19:55 01/17/08 19:55
Joined: Mar 2006 Posts: 2,758 Antwerp,Belgium frazzle Expert
frazzle Expert Joined: Mar 2006 Posts: 2,758 Antwerp,Belgium	Thanks for putting this in the UC Nils, I'll see what happens if I cut done the conditionals thus I need to think of a way to handle the different depth maps off course Cheers Frazzle Antec� Case Intel� X58 Chipset Intel� i7 975 Quad Core 8 GB RAM DDR3 SSD OCZ�-VERTEX2 3.5 x4 ; HD 600 GB NVIDIA� GeForce GTX 295 Memory 1795GB

Re: Variance Shadow Mapping [Re: frazzle] #178214 02/15/08 04:32 02/15/08 04:32
Joined: Sep 2005 Posts: 508 Texas not_me User
not_me User Joined: Sep 2005 Posts: 508 Texas	now you say its possible with a6 comm and r2t dll? if so how? -Initiate Games -Level designer http://www.sckratchmagazine.com

Re: Variance Shadow Mapping [Re: not_me] #178215 02/15/08 15:27 02/15/08 15:27
Joined: May 2005 Posts: 2,713 L�beck Slin OP Expert
Slin OP Expert Joined: May 2005 Posts: 2,713 L�beck	Quote: now you say its possible with a6 comm and r2t dll? if so how? It is, but it is quite a bit of work for which I don�t have the time at the moment. I�ve got some plans for further shadowdevelopement, but at the moment I have to gain some more math skills and a better knowledge of directx. I am working on it, but it will take quite a bit of time. But then I hope that it�ll work for A6 as well. And also that it will run on more systems, without problems. At the moment I am trying to get this working...: http://www.cg.tuwien.ac.at/~scherzer/lssm/index.html I don�t know how the whole thing will turn out, if it ever will But if you want to convert the code to c-script, you will have to replace the stages feature and the viewmaterials, through materialevents and a viewaligned quad... Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en) Shader Tutorial (ger) http://www.slindev.com

Re: Variance Shadow Mapping [Re: Slin] #178216 02/18/08 15:21 02/18/08 15:21
Joined: Apr 2007 Posts: 3,751 Canada WretchedSid Expert
WretchedSid Expert Joined: Apr 2007 Posts: 3,751 Canada	Hey, das gef�llt mir echt gut. Leider hab ich ein kleines Problem. Die Kamera befindet sich in meinem Spiel ca. 6000 Quants von den Objekten entfernt und auf die Entfernung wird kein Schatten mehr gezeigt. Jetzt hab ich die Modelle runterskaliert und die Kamera n�her an die Objekte gebracht, aber da treten ein paar unsch�ne neben Effekte auf ( http://www4.picfront.org/picture/erN6FSvqfJc/img/Shadow.png ). Gibt es eine M�glichkeit eines der Probleme in den Griff zu bekommen? Ich bin absoluter Noob in sachen Shadern, also bitte nicht mit Fachlatein erschlagen. Shitlord by trade and passion. Graphics programmer at Laminar Research. I write blog posts at feresignum.com

Re: Variance Shadow Mapping [Re: Slin] #178217 02/18/08 18:13 02/18/08 18:13
Joined: Feb 2006 Posts: 2,185 mpdeveloper_B Expert
mpdeveloper_B Expert Joined: Feb 2006 Posts: 2,185	Quote: Quote: now you say its possible with a6 comm and r2t dll? if so how? It is, but it is quite a bit of work for which I don�t have the time at the moment. I�ve got some plans for further shadowdevelopement, but at the moment I have to gain some more math skills and a better knowledge of directx. I am working on it, but it will take quite a bit of time. But then I hope that it�ll work for A6 as well. And also that it will run on more systems, without problems. At the moment I am trying to get this working...: http://www.cg.tuwien.ac.at/~scherzer/lssm/index.html I don�t know how the whole thing will turn out, if it ever will But if you want to convert the code to c-script, you will have to replace the stages feature and the viewmaterials, through materialevents and a viewaligned quad... wow, it's nice to know that, i would try to do it, but right now i don't have time for it Last edited by mpdeveloper_B; 02/18/08 18:15. - aka Manslayer101

Re: Variance Shadow Mapping [Re: WretchedSid] #178218 02/18/08 18:23 02/18/08 18:23
Joined: Sep 2003 Posts: 5,900 Bielefeld, Germany Pappenheimer Senior Expert
Pappenheimer Senior Expert Joined: Sep 2003 Posts: 5,900 Bielefeld, Germany	Konstruiere das Haus mit einem Dach�berstand! Slin hat den Shader programmiert, so gut er konnte, und hat damit schon einige Erfahrung. Wenn er gewu�t h�tte, wie es besser geht, h�tte er es bereits entsprechend programmiert. Jede Modifikation an dem Shader wird zu kompliziert sein, als dass man es als Neuling verstehen kann, w�rde ich aus meinen Beobachtungen schlie�en. http://www.puppenheim.org/ http://www.wuerfels-welt.de Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip http://www.puppenheim.org/blender_starting_main_settings.txt

Re: Variance Shadow Mapping [Re: WretchedSid] #178219 02/18/08 19:01 02/18/08 19:01
Joined: May 2005 Posts: 2,713 L�beck Slin OP Expert
Slin OP Expert Joined: May 2005 Posts: 2,713 L�beck	Quote: Hey, das gef�llt mir echt gut. Leider hab ich ein kleines Problem. Die Kamera befindet sich in meinem Spiel ca. 6000 Quants von den Objekten entfernt und auf die Entfernung wird kein Schatten mehr gezeigt. Jetzt hab ich die Modelle runterskaliert und die Kamera n�her an die Objekte gebracht, aber da treten ein paar unsch�ne neben Effekte auf ( http://www4.picfront.org/picture/erN6FSvqfJc/img/Shadow.png ). Gibt es eine M�glichkeit eines der Probleme in den Griff zu bekommen? Ich bin absoluter Noob in sachen Shadern, also bitte nicht mit Fachlatein erschlagen. Versuch dein Level mal im Verh�ltnis zum unskalierten Cbabe-Modell zu bauen. Dann hast du das Gr��enverh�ltnis mit welchem ich die Schatten nutze. Dein "Problem" kenne ich, habe aber bisher nur eine Vermutung worann es liegen k�nnte und es bisher nur durch vorsichtige Lichtquellenplatzierung und relativ gro�em Bias weniger sichtbar machen k�nnen. Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en) Shader Tutorial (ger) http://www.slindev.com

Re: Variance Shadow Mapping [Re: Slin] #178220 02/20/08 22:38 02/20/08 22:38
Joined: Jan 2007 Posts: 1,619 Germany Scorpion Serious User
Scorpion Serious User Joined: Jan 2007 Posts: 1,619 Germany	Es liegt doch dadran, dass jeder Texel der Shadowmap eine gewisse Gr��e hat. Wenn jetzt eine Fl�che ziemlich steil zur Lichtquelle steht, werden nat�rlich weniger Texel f�r das speichern der Entfernung benutzt. Sodass der Wert dann an dieser Fl�che manchmal gleichgro�, manchmal gr��er ist als die Entfernung. Die Striche kommen daher, dass immer nur die Kanten der einzelnen Texel ausreichen um es beleuchten...der Rest nicht. Es sollte wahrscheinlich schon reichen einen gewissen toleranzwert zu setzten, in dem dann noch Schatten herrscht. Habe mich aber noch nicht n�her mit diesem Shader besch�ftigt und stelle hier nur Vermutungen an. PS: Als ich versucht habe den Shader in ein eigenes Projekt einzubinden, sind alle Objekte, bis auf die mit Alphachanel unsichtbar geworden :S Naja, wird wohl mein Fehler sein...

Re: Variance Shadow Mapping [Re: Scorpion] #178221 02/28/08 16:23 02/28/08 16:23
Joined: Nov 2007 Posts: 1,032 Croatia croman Serious User
croman Serious User Joined: Nov 2007 Posts: 1,032 Croatia	Great work Slin. Can you please post a really small tutorial on how to implement those shadows in other project. How to, for example, get this stuff working with a single model in very simple level. I and other people would really appreciate it. Can you do that, please? Thanks in front. Ubi bene, ibi Patria.

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