What's wrong with these polygons?
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@chris fullmer said:
I think Dave's got some good intuition on that -
. Could you upload the model?Allright, here it is:
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its just something to see with shadows, if you change a little the hour or the month everything goes ok.
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yeah.. thats the way the flat surfaces are shading (you can't have a truly gradual shade on a curved object being represented by flat facets.. not inside of sketchup itself..)
here's your model with the sun position changed.. now you have 'problem' polygons in other locations.. see?
[edit- yeah.. what gilles is saying]
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@gilles said:
its just something to see with shadows, if you change a little the hour or the month everything goes ok.
Do you think so? They look very hard-edged on a render. I don't like it at all ))
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@gilles said:
its just something to see with shadows, if you change a little the hour or the month everything goes ok.
@unknownuser said:
yeah.. thats the way the flat surfaces are shading (you can't have a truly gradual shade on a curved object being represented by flat facets.. not inside of sketchup itself..)
here's your model with the sun position changed.. now you have 'problem' polygons in other locations.. see?
[attachment=0:1f7woi5z]<!-- ia0 -->zil_debug.skp<!-- ia0 -->[/attachment:1f7woi5z]
[edit- yeah.. what gilles is saying]
Now i understand. I made a render with another sun position and yes, hard edges appeared in the some new positions. And how it can be avoided? I need to make more hi-poly model?
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I am not very aware with render, but you must have option in them to soft edges without increasing geometry.
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What software are you using to render with?
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In SketchUp you'll see that those faces that are extra dark are in a shadow from the sun. Try this, turn off shadows and turn on "Use Sun for Shading". You see you get a smooth shading, but no hard shadow lines. I know that doesn't help with V-Ray though.
Maybe in v-ray do something to help diffuse your sunlight. I'm not sure how V-Ray works, but can you make you sun physically larger? I think it would help if you didn't have a small point of light casting the shadows, but if you had instead a large light that would create softer shadows. That might be something to try.
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@chris fullmer said:
In SketchUp you'll see that those faces that are extra dark are in a shadow from the sun. Try this, turn off shadows and turn on "Use Sun for Shading". You see you get a smooth shading, but no hard shadow lines. I know that doesn't help with V-Ray though.
Maybe in v-ray do something to help diffuse your sunlight. I'm not sure how V-Ray works, but can you make you sun physically larger? I think it would help if you didn't have a small point of light casting the shadows, but if you had instead a large light that would create softer shadows. That might be something to try.
Thank you very much for bringing me to a couple of ideas!
1.Increase the size of the sun (1 to 24):
- Do not use the sunlight at all. I tried a rectalgular light instead:
I think I shall not use sunlight with this model.
And thanks to all for suggestions! - Do not use the sunlight at all. I tried a rectalgular light instead:
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