Render preview in viewport different with regular render #45586

New Issue

Leroy · 2015-07-28T02:38:32+02:00

Leroy commented

2015-07-28 02:38:32 +02:00

System Information
windows 7 with sp1

Blender Version
Broken: 2.75a c27589e
Worked: (optional)

Short description of error

With small size light, the transition between light and shadow have clear sawtooth in preview render(left), but smooth in regular render(right)
Exact steps for others to reproduce the error
As shown above, just one sphere with smooth shade, and the light keep default, just increase the light strength, notice the light size with 0.1, and you can see, the transition between light and shadow have clear sawtooth , though you can solve it by increase the light size, but the shadow will become soft. as you know , the regular render can't find this, just in viewport render. and I guess this problem created by truth normal, and not the smooth normal, though it's not affect the final result, but not good for preview, maybe this one bug, or maybe I don't know the option where to set this. sorry for my stupid :D

**System Information** windows 7 with sp1 **Blender Version** Broken: 2.75a c27589e Worked: (optional) **Short description of error** ![8.png](https://archive.blender.org/developer/F213707/8.png) With small size light, the transition between light and shadow have clear sawtooth in preview render(left), but smooth in regular render(right) **Exact steps for others to reproduce the error** As shown above, just one sphere with smooth shade, and the light keep default, just increase the light strength, notice the light size with 0.1, and you can see, the transition between light and shadow have clear sawtooth , though you can solve it by increase the light size, but the shadow will become soft. as you know , the regular render can't find this, just in viewport render. and I guess this problem created by truth normal, and not the smooth normal, though it's not affect the final result, but not good for preview, maybe this one bug, or maybe I don't know the option where to set this. sorry for my stupid :D

Leroy commented

2015-07-28 02:38:32 +02:00

Changed status to: 'Open'

Leroy commented

2015-07-28 02:38:32 +02:00

Added subscriber: @Leroy-Xie

Sebastian Koenig commented

2015-07-28 08:13:55 +02:00

Added subscriber: @sebastian_k

Sebastian Koenig commented

2015-07-28 08:13:55 +02:00

Are you sure you don't have a Subsurf Modifier on that sphere with a different detail setting for viewport and render?
Because with just a default sphere I cannot reproduce it.
Maybe you can attach your blend file?

Are you sure you don't have a Subsurf Modifier on that sphere with a different detail setting for viewport and render? Because with just a default sphere I cannot reproduce it. Maybe you can attach your blend file?

Sergey Sharybin commented

2015-07-28 10:28:52 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2015-07-28 10:28:52 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-07-28 10:28:52 +02:00

Sergey Sharybin self-assigned this 2015-07-28 10:28:52 +02:00

Sergey Sharybin commented

2015-07-28 10:28:52 +02:00

You've got difference subdivisions levels for render and viewport in your model and viewport levels are not enough to produce nice smooth interpolation of normals. It is known behavior, will be eventually improved but for now is not considered a bug.

Leroy commented

2015-07-28 13:06:37 +02:00

In #45586#324327, @sebastian_k wrote:
Are you sure you don't have a Subsurf Modifier on that sphere with a different detail setting for viewport and render?
Because with just a default sphere I cannot reproduce it.
Maybe you can attach your blend file?

In #45586#324337, @Sergey wrote:
You've got difference subdivisions levels for render and viewport in your model and viewport levels are not enough to produce nice smooth interpolation of normals. It is known behavior, will be eventually improved but for now is not considered a bug.

sphere.blend

this is .blend file ,maybe my english not good ,you can't see it clear, I'm meaning no subdivision modifier, preview and render all same samples, this produced affected by the light size and the face in mesh( e.g. add much more sudvision will much more smooth ), more small light , more hard shadow， more sawtooth... and I do it again, and the sawtooth have in render, not affected by the smooth shade:(

> In #45586#324327, @sebastian_k wrote: > Are you sure you don't have a Subsurf Modifier on that sphere with a different detail setting for viewport and render? > Because with just a default sphere I cannot reproduce it. > Maybe you can attach your blend file? > In #45586#324337, @Sergey wrote: > You've got difference subdivisions levels for render and viewport in your model and viewport levels are not enough to produce nice smooth interpolation of normals. It is known behavior, will be eventually improved but for now is not considered a bug. [sphere.blend](https://archive.blender.org/developer/F214370/sphere.blend) this is .blend file ,maybe my english not good ,you can't see it clear, I'm meaning no subdivision modifier, preview and render all same samples, this produced affected by the light size and the face in mesh( e.g. add much more sudvision will much more smooth ), more small light , more hard shadow， more sawtooth... and I do it again, and the sawtooth have in render, not affected by the smooth shade:(

Sebastian Koenig commented

2015-07-28 14:30:15 +02:00

Weird. For me this renders identical. Can't see any errors.

Weird. For me this renders identical. Can't see any errors. ![render_smoothing.jpg](https://archive.blender.org/developer/F214417/render_smoothing.jpg)

Sergey Sharybin commented

2015-07-28 14:41:56 +02:00

Same happens here, in both viewport and final reneder you can see that there's shading artifacts. This happens exactly because of too much different normals on the face vertices which is causing artifacts after interpolation the normals.

Just add subsurf modifier to make normals closer to "ideal" ones.

Same happens here, in both viewport and final reneder you can see that there's shading artifacts. This happens exactly because of too much different normals on the face vertices which is causing artifacts after interpolation the normals. Just add subsurf modifier to make normals closer to "ideal" ones.

Leroy commented

2015-07-28 14:50:15 +02:00

In #45586#324445, @sebastian_k wrote:
Weird. For me this renders identical. Can't see any errors.

the transition area between light and shadow at the sphere have clear sawtooth,,,not smooth ,the normal is smooth shade,,but it's have sawtooth, it's flat shade at transition, only flat at the transition area, I'm wrong at first , sorry for that, I am focus at the sawtooth, my friend tell me the Octane render have same error before, but fix now, and same problem at cycles, through you can add subdivision on mesh ,or set the light much more big, it's meaning the shadow much more soft.

> In #45586#324445, @sebastian_k wrote: > Weird. For me this renders identical. Can't see any errors. > ![render_smoothing.jpg](https://archive.blender.org/developer/F214417/render_smoothing.jpg) ![23.png](https://archive.blender.org/developer/F214433/23.png) the transition area between light and shadow at the sphere have clear sawtooth,,,not smooth ,the normal is smooth shade,,but it's have sawtooth, it's flat shade at transition, only flat at the transition area, I'm wrong at first , sorry for that, I am focus at the sawtooth, my friend tell me the Octane render have same error before, but fix now, and same problem at cycles, through you can add subdivision on mesh ,or set the light much more big, it's meaning the shadow much more soft.

Leroy commented

2015-07-28 14:58:20 +02:00

if mode simple, can add subdivision, but not an practical method for complex mode, it's should have optimization on cylces, I guess have much more good method :(

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Render preview in viewport different with regular render #45586