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Messages - Steve

Pages: 1 ... 130 131 [132] 133 134 ... 137
1966
Anim8or v0.98 Discussion Forum / Re: texture messed up
« on: April 05, 2008, 05:57:15 pm »
I wahted to update everyone on this.  I suspect that these problems have something to do with the shadow bias that the raytracer uses to prevent self shadowing artifacts.  I'm still looking into the problem.

1967
Objects are referenced by name in a Figure.  Anim8or doesn't remove the reference in a Figure when you delete an Object so that you can substitute another Object without having to redo all the settings.

1968
Anim8or v0.98 Discussion Forum / Re: Really wierd render bug
« on: April 05, 2008, 05:44:46 pm »
Yes, I'll probably remove this.  Maybe I'll try and make an Anim8or project with some of the test cases in it.

1969
No there is not any way to add your own shaders to Anim8or.  It would be quite a bit of work to do that because they'd have to be supported by the OpenGL, scanline and ray tracer renderers.

1970
Anim8or v0.98 Discussion Forum / Re: 2 sided materials
« on: April 02, 2008, 12:22:21 pm »
The ray tracer wasn't designed to handle two sided materials.  Toon shadiing using one sided shells isn't physically consistent so I'm not sure it would work as well with a ray tracer.

1971
Anim8or v0.98 Discussion Forum / Re: Shadow Bug...
« on: April 01, 2008, 02:05:10 am »
The Shadow Bias setting is mpt currently used by the Art ray tracer.  The concept doesn't extend well to ray tracing since movig the shadow backwards only looks OK from the front.  It could appear very much worse from the point of view of a reflection.  I use other techniques to try and avoid the problem here (but I suspect that they are the cause of the shadow problems shown in other posts.)

1972
Anim8or v0.98 Discussion Forum / Re: Shadow Bug...
« on: March 31, 2008, 02:51:29 pm »
This rendering artifact is caused by an inconsistency in the geometry and shading of your object.  Ray tracing is based on modeling a physical world.  The only 100% correct way to do ray tracing is to model all triangles as flat faces.  When smooth shading is used (like in Anim8or) you are essentially lying to the ray tracer.  The surface is not smoothly curved and yet you want it to appear that it is.  So ther ray tracer distorts the normal used for lighting.  This is inconsistent.

The scanline renderer is able to avoid much of this problem by moving the shadows backwards into the object.  It is not perfect and works OK as long as you can't see the back (like with reflections).  There is even a parameter that you can set to control how far to push the shadows.  That hack doesn't work so well for ray tracing.

The best way to avoid these artifacts is to use more faces on curved surfaces (by subdivision or simply setting the polygon count higher for a parameteric object like a sphere).

1973
You're right, ART doesn't support the alpha or depth channels yet.

1974
No, shadows of transparent objects are still black.  That may be supported in an update but I still have a bit of code to write for it.

1975
Anim8or v0.98 Discussion Forum / Re: Torus not recognized
« on: March 30, 2008, 09:12:06 pm »
Check the scripts directory and the "Preload SCripts" settin gin the Configuration dialog.

1976
Good ideas.  I'll see if I can get at least an ortho camera in in the next v0.97 preview or so.

1977
Anim8or v0.98 Discussion Forum / Re: Tool Tips
« on: March 28, 2008, 04:49:00 pm »
Sorry about thism Blank.  Tool-tips are supposed to default to on but it doesn't seem to be working.  Maybe I should make them always stay enabled!

1978
Flametiger74 - Please don't continue with this discussion in thes thread.  Post this to a new topic.  This thread simply anounces that v0.97 is available.  It is not for bug reports. 

1979
Anim8or v0.98 Discussion Forum / Re: texture messed up
« on: March 28, 2008, 04:14:12 pm »
Yes, there is a bug in the ray tracer.  I'm looking for the cause.  More examples would really be helpful.  Siragin, can you e-mail me your .an8 file?

1980
Anim8or v0.98 Discussion Forum / Re: Trouble with atributes
« on: March 28, 2008, 04:11:04 pm »
You need to click the "New" button and type in the name of the attribute that you want to add.  Then click "OK" and select the type, set the value, and you're done.

Attributes are a general mechanism to add things that aren't directly supported by Anim8or.  There are many applications that read and write .an8 format files.  Attributes allow those apps to export models to Anim8or to be edited and read them back in while retaining arbitrary other information that they may need.

I used them to extend materials for the initial ray tracing renderer.  Yes, I know they aren't as convenient as built in buttons.  But since the ray tracer is still getting new features attributes are a fast way to support them.  Writing the dialog code is very time consuming so this allows me to get the ray tracing preview out much sooner and to not waste time rewriting the material dialogs each time the ray tracer changes.

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