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Al Hart

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  1. Thanks - this is a good page. I have been looking around for other peoples rendering tip ideas and this seems to be a very good set of rendering lessons.
  2. With regard to camera lights. Remember this is a tip for people who want to save time or who don't have the skill to illuminate a scene properly. Here is an interior office scene illuminated with mediocre ceiling lights and lighting coming in from the hallway. Here is the same scene with two lights attached to the camera - one left and below, one right and above. After automatic balancing due to photometrics, the effect is much what you would expect - the foreground is somewhat brighter and the background is somewhat darker. Of course you can balance the camera light effect by raising or lowering the intensity of the camera lights. (Or you can even blend the two images in Photoshop) One reason this is an interesting effect for office furniture dealers is that they tend to layout about 400 workstations, place ceiling lights and perhaps a few task lights, and the want to quickly make images of just a few of the workstations for the clients review. By using lights attached to the camera they can quickly render the workstations desired without having to a
  3. Does Vray always fully illuminate a bitmap material. What if you have a poster which is also a bitmap, but is illuminated by a spotlight. In this example, the poster on the left is illuminated by a spotlight (and therefore darker in the corners), while the poster on the right is evenly backlit.
  4. I'm trying to make tips which are renderer independent. This tip would apply to a renderer which allowed you to mark a specific object as rendering as if it were illuminated, without actually placing lights in front of it, placing lights behind it or treating it as a light source. I believe there are several rendering engines which have this concept of "self illumination". Of course, a television set, or a back lit sign, does provide illumination in the real world, but unless you are emphasizing this effect - such as a TV in a dark room - it may be easier to brighten up the TV screen without making it an actual light. (Many of my rendering tips are shortcuts to achieving an effect without replicating things perfectly. For example, (a stupid, extreme example), it your television set is a LED model, then you should place millions of LED lights - eash of a different color - to more perfectly emulate the way the television illunimates the rest of the scene) How do you handle television screens currently?
  5. (Self glow applied to television screen) Self Glow illuminates a surface as if it had light shining on it, without actually making it a light. * Balance illumination in scene without adding additional lights. * More realistic signs, monitors and projection devices. * Faster rendering times. * Read more * Read all Rendering Tips from Render Plus
  6. No - I quickly modified the tip to mean "one or more flashes attached to the camera, but separated from the camera by a fixed distance.) SketchUp (which is the modeling package I work with the most) has a feature in the "Film and Stage" plugin has a feature which automatically places a camera component (block/symbol) at the camera location and alignes it with the camera view. If you were to build your camera component with two lights attached, then, after the plugin aligned the camera, the light would easily be used in the scene, and when you went to a new view, amd realigned the camera the lights would come with it. If I get time, I'll try to upload an image with a couple of camera lights added from a couple of views. (The table and chair image was not designed to look good - it was designed to show what the flash would look like in an, otherwise unlit scene)
  7. Yes. I think that is the meaning of the word TIP - "My way of the highway". (This sentence is in jest - for those foreigners who cannot recognize sarcasm) I didn't expect such a violent reaction to this tip as I got. I run a Rendering Workshop on another forum, and for the subject one week I gave them a sink and mirror which they were supposed to place in a bathroom and render. Here is a rendering from one of the beginners: I don't know if a couple of lights attached to the camera (but not right next to the lens) would help here, but clearly some advice might be good. (It is possible that he achieved just the lighting look he wanted. But since the Workshop was about rendering the sink and mirror, I thought it should have some effects added which effected the sink and mirror) Here was my reply:
  8. Yes - that would probably come pretty close. On of the things we try to do with several of our add-ons for SketchUp is to do things directly from SketchUp which other users could - either easily, or with some effort - do in PhotoShop. I good example is soft shadows. We make the soft shadows image by combing 20 or more individual shadow images from SketchUp. This could be done in Photoshop, but is much easier if a ruby script does it all for you. This image is made by blending multiple SketchUp shadow images - at different dates and times - into a single image.
  9. This Panorama was made for a demonstration of the concept. (A combination of IRender nXt and EasyPano). The client has made several better panoramas and placed them on his web site. see: http://www.keystage.com/projects/panorama.html for some bewtter examples. (click on image to load panorama)
  10. Have you tried the AccuRender nXt plugin for SketchUp: http://www.renderplus.com/htm/render_plus.htm AccuRender nXt is available for AutoCAD, Revit, Rhino and SketchUp.
  11. Wow! I didn't expect such a negative response. Perhaps this is not a good idea. But I still think that some scenes, especially by beginning (or perhaps lackadaisical) renderers, can be easily improved with some camera oriented lighting. But maybe the is a lot to be said for learning how to position lights well.
  12. Ah - now I understand. I need to modify my tip to make it clear that I am referring to multiple lights attached to the camera - but they can be offset as far as desird - left and right, up and down.
  13. Oh. Remember that the image I included is intentionally harsh. The camera light should be used to augment other lighting.
  14. By using lights attached to the camera, you can: *Add illumination which moves with the camera. *Make it easy to render several views of a model without having to add additional lights for each view. *Insure that the objects you are focusing on are well illuminated. Scene rendered with lights attached to the camera. It is often very difficult to place enough lights in your drawing to be fully realistic. Ambient light settings help with this, but often produce a flat effect. By placing movable lights, attached to the camera you can add effective illumination and highlighting which will be used for all views. Lights which move with your camera make it easier to illuminate scenes with out having to place lights for every view angle you may want to use. [Edit: These can be multiple lights attached to the camera - but they can be offset as far as desired - left and right, up and down.] You can, and should, add lights to your scene - especially lights which will appear in the rendered image. However, a couple of lights placed near the camera will provide good illumination for the rest of the scene. Align Lights before Rendering Some rendering packages will automatically align the lights to the view when you render. For SketchUp users, for more information on how to create Camera Lights and use the SketchUp plugin to align them, see this article on the Render Plus Web Site: Camera Lights For more of out Rendering Tips, See: Rendering Tips
  15. We are working of a feature to create panoramic images from SketchUp models. Here is an example of a panoramic image create from a model supplied by a user (boothy) Note: for this image a single camera is used and it is swept through 360 degrees' We used an external program to convert the image to a flash movie. Here is a link to the panorama: Panorama
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