9 Replies Latest reply on Apr 18, 2011 8:59 AM by Szalam

    Blue diffuse skylight?

    Karel Bata Level 1

      I want the effect of diffuse blue light from a sky, but Idon't see any softlights available in the light creation tool.

       

      Am I missing something? Or is there a clever trick?

       

      I'm using CS5.

       

      Thanks!

        • 1. Re: Blue diffuse skylight?
          Rick Gerard Adobe Community Professional & MVP

          Add ambient light.

          • 2. Re: Blue diffuse skylight?
            Karel Bata Level 1

            Thanks for trying, but ambient light has no source but rather contributes to the overall brightness of a scene and casts no shadows.

             

            Not the same thing as skylight which is diffuse, comes from above, and casts shadows.

            • 3. Re: Blue diffuse skylight?
              Rick Gerard Adobe Community Professional & MVP

              Add a point light. Position the point light high above the composition. Adjust the shadow diffusion and intensity. If needed add a little ambient light. Lights in AE don't fall off with distance so this will give you a good approximation of soft skylight.

              • 4. Re: Blue diffuse skylight?
                Karel Bata Level 1

                Ah. So a point light can be set to cast soft shadows? OK. That's totally illogical in that it's not how the real world works, but it makes sense in AE which is just math.

                 

                Thanks.

                 

                 

                Wait a mo:

                Shadow Diffusion
                Sets the softness of a shadow based on its apparent distance from the shadowing layer. Larger values create softer shadows. This control is active only if Casts Shadows is selected.

                and

                 

                The Casts Shadows material option must be On for a layer to cast shadows;

                 

                 

                Unfortunately my scene is full of objects created in Particular, which offers no such material options. So, er, back to original question...

                • 5. Re: Blue diffuse skylight?
                  Karel Bata Level 1

                  Is it possible to crerate a large rectangular object and have that emit light?

                  • 6. Re: Blue diffuse skylight?
                    Rick Gerard Adobe Community Professional & MVP

                     

                     

                    Ah. So a point light can be set to cast soft shadows? OK. That's totally illogical in that it's not how the real world works, but it makes sense in AE which is just math.


                    A soft white light bulb, the ones that are white and not clear glass, cast softer shadows than a light bulb made with clear glass... makes sense to me that you can adjust the softness of the shadows. Point light may be an inaccurate term. Bare Bulb may be better.

                     

                    And no, You can't set a rectangle to emit light but you can set a solid between the light and then set the solid layer's light transmission to 100% It's kind of like putting a filter in front of the light.

                     

                    If you run a Google search you'll find some ideas on creating shadows from Particular. Some of them are very clever. In it's current version the only option is to have particles cast shadows on each other.

                    ShadowSetup.png

                    That's what a large blue solid placed between a point light looks like when light transmission is set to 100%. Hope this helps.

                    • 7. Re: Blue diffuse skylight?
                      Karel Bata Level 1

                      Thanks. I'll try that.

                       

                      The closest to a point source in the real world (outside of a physics lab or an X-Ray machine) is a xenon discharge bulb. These have tiny arcs and are therefore used for things like searchlights and in some projectors. Xenon car headlights are a hybrid. All tungsten lights have a filament, making them ever so slightly soft. A frosted bulb is much softer - the area providing illumination being at least a thousand times bigger than the filament within - and any kind of reflector or diffusion will soften it further. But there's a long way to go before it's anywhere near as soft as the light you get coming from the sky if you have no direct sunlight...

                       

                      Would be nice to have an option offering a striplight. These are soft in one axis, and quite hard in another, giving the light a peculiar and unnatural quality all of its own, even when color corrected.

                      • 8. Re: Blue diffuse skylight?
                        Mylenium Most Valuable Participant

                        AE has no raytracing engine, so simulating anything from spectral sky to ambient occlusion to area shadows is not possible.

                         

                        Mylenium

                        • 9. Re: Blue diffuse skylight?
                          Szalam Adobe Community Professional & MVP

                          Rick Gerard wrote:

                           

                          ...Lights in AE don't fall off with distance...

                          Not in version 10 (AKA CS5), but in the version that comes out in may (10.5 or CS5.5) they do