Linear lamps considered as multiples points

According to the image below, it seems that linear lamps are considered as multiples points, which gives stranges reflexions.

So, each new pass adds a "new" light and at hte end, (so long sometimes) it lokks like a linear lamp.

Here is a final result after lot of passes.

Isn't it possible to improve that point?

Alain

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Permalink Reply by Render Plus on January 11, 2012 at 9:14am

Linear lamps, area lamps, etc create softer shadows by sampling multiple points on the lamp. But they will take hundreds of passes to converge properly.

You can use the new Path Tracer engine (available on the Render Setup tab) which will sample all points on the light on every pass, and will process each pass faster, but will take even more passes.

You can converge in fewer passes if you replace the linear lamp with multiple lamps - but you will then have more lights - so each pass will take longer.

You can aso specify that more bulbs are processed per pass on the Lights SetUp tab. This will converge in fewer passes, but take longer per pass. It will only have an effect when you have more than 5 lights as in your first image.

For a bulb like this, you should use "Object Properties" to create the light - right click on the bulb and make it a light. But it will have the same, multiple-samples, multiple passes required effect.

We have a "resume Rendering" icon on the rendering window which allows you to let it render for 100 passes or more, and then add more passes without having to restart the rendering.