Jump to content
  • Advertisement


  • Content count

  • Joined

  • Last visited

Community Reputation

152 Neutral

About GameEngineer_gi

  • Rank

Personal Information

  • Interests

Recent Profile Visitors

3138 profile views
  1. Games often highlight collectibles with halos or in the case of Wolfenstein with a cycling white stripe. Its hard to see here with a still image but picture the white stripe moving across the object texture. I assume its done in the collectible's shader code and perhaps its much more simple than I thought but am I on the right track here? (images from "Wolfenstein New Colossus")
  2. GameEngineer_gi

    Male Character Introduction

    I'm sure it is very satisfying to go from a blank modeling screen to rigged character. Need to go check out your game project page.
  3. GameEngineer_gi

    Female Character Upgrade

    My vote is for the the left, cartoony one. Both are good though.
  4. GameEngineer_gi

    How to determine if object is in view

      Depends on the customer but typically its NVidia Quadro K2000 or K4200.  We even have some Quadro 2000 (no 'K' version).  Always Quadro, however.  I have no control over that unfortunately.        The 32-bit Z-buffer would probably make a big difference however even on recent (NVidia Quadro) cards however I cannot seem to create a 32-bit depth buffer without losing my multi-sample buffer bits.  That means no anti-aliasing which makes scene look worse than having Z-fighting.    As for swapping the near and far parameters I remember seeing this talked about in an Outerra article http://outerra.blogspot.com/2012/11/maximizing-depth-buffer-range-and.html In my previous reply I add that I am using Vega Pirme and I do not have access to their projection matrix.  I would have to take over the rendering pipeline.  Which I may have to eventually do but that will not be easy.   So let's say I do take over the projection matrix and swap near and far values, does this solution "just work" given that I change the depth test type?  Seems too easy.   This is along the lines of what L. Spiro suggested.  Given my limitations with the depth buffer size and projection matrix reversed near/far plane matrix this solution may be my only robust solution even though it costs some in performance.    Based on both of your feedback I have decided to drop further investigation into a "better hack" and pursue the 2-pass render.  I tried this a few years ago but after having trouble with the shadows I gave up.... perhaps too quickly.  There may be a way to manipulate Vega Prime's dynamic shadow object to swap to both channels or maybe create two dynamic shadow objects.  There are pros and cons to working with third party libaries and I may be running into the con as far as what I can do using their system of classes (and not have access to source code).   Thanks so much.  I feel encouraged to give the 2-channel (ie 2-pass) rendering another try.   -Steve
  5. GameEngineer_gi

    How to determine if object is in view

      Thanks!  To add more details to this I use a third party library called Vega Prime which handles much of the internal graphics rendering.  Following their "canned" usage model is what told me you could only have one dynamic shadow generator for one channel.  But perhaps with some digging I can figure out how to do as you suggest and render the channel with shadows on both channels without driving the system to its knees.
  6. GameEngineer_gi

    How to determine if object is in view

    Good call. But we already have the depth buffer max'd out to 24 bits which is supported by the video cards we use.  Typical flights sims don't have this problem as bad because you can LOD you far geometry out of the scene, no flicker if not being rendered.  But camera view zooming messes up the works.   A co-worker this morning said I would be polishing the horse and buggy wheels if I continue down the masking track even if it used pixel perfect resolution.  They suggest I buy a new car and pursue my second approach which is a design change.   But I still am interested in knowing how to detect the object is in view.
  7. We have a flight simulator application where one of the primary views comes from the EO/IR ("skyball) camera connected to the bottom of the "ownship" aircraft.  You can gimbal and zoom the camera.  The problem is since this camera can zoom (reduce FOV) quite far we see Z-fighting.  To address the Z-fighting I move the near plane out a few hundred meters and problem is fixed.  However that introduces a new problem.  Now you can't see the "ownship" because it is being clipped out by the near plane that is not very near the (air)plane, if you catch my drift! :)  So to address that we create silly masks which are nothing more then quads that positioned from the camera's view point.  We have to set their positions to cover up the aircraft mesh and then during the game loop we check if the camera's azimuth or elevation (pitch) angles are inside a mask quad, we say that the camera is "masked" by the ownship and therefore pull the near plane back to its normal position of about 0.1 meters.    This hack works pretty good until you are in a masked condition (you can see a wing in the view for example) but you are looking far off into the distance.  You get the Z-fighting again because since we are maksed we have to pull the near plane back so we can see the wing or any other part of the aircraft.  You can define as many mask (quads) that conform to the aircraft shape as seen from this camera but you can never get it a perfect fit.   But I want to see if we can do this better, without masks.  I am using OpengGL 3.3+ and GLSL 330 and want to know if there is a better way to check if an object (the ownship 3d model) is in view, are any of its pixel fragments in the view port at any given time?  I am not a GLSL expert so that's why I am coming to the experts.     There is another approach I thought about which eliminates the need for masking altogether but it may not work so well with our shadows.  I'll just throw this one out but I want to focus on the current approach first.  This approach renders two channels where one channel defines near and far planes close to the aircraft ownship, near == 0.1m and far==500m.  The second channel defines the near as 500m and the far as 130000m (flight sim so we need a far far plane distance at a high altitutde).  So the 2nd channel draws the further scene where the 1st channel leaves off.  I tried this way and it did seem to work however our dynamic shadows have to be attached to only one channel.  This requires drawing the scene twice and our scene can get pretty heavy so its not my first choice.  That's why we went for the more hacky way first.  I may need to work with this approach more, however.   In the mean time I want to pursue improving our current solution.  Any ideas would be helpful.   Wow, its been many years since I've been on this site.  Lots of changes that look great!   -Steve
  8. Great article!  I do agree with everything you said but sometimes I deviate from doing the highest priority tasks to some of the easier or fun ones when my motivation is dipping.  It makes me feel like I am accomplishing something which helps motivate me back to the harder tasks.   I also very much agree with waiting on optimization until the feature is basically working first.  This one is hard for me but I know its important.
  9. GameEngineer_gi

    Eww, ID3DXSprite. Eww.

    Evil Steve, Great write up. Very appreciated. I've been using ID3DXSprite for some time now and never really gave it a second thought until I asked one of the instructors at the Game Institute a question about it. I'm going to piece together my own sprite class and do some benchmarking with ID3DXSprite. Seems they create new buffers on every frame, seems wasteful to me. Steve
  • Advertisement

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!