Hi Folks

I'm trying to create a 3D logo from a flat black and white version. I've
tried doing using a height field. When I render an animated sequence the
logo looks like it's transparent at the sides. Does anyone know why?

Is there a better way of doing this? Here is the pov file and the
original logo. Also frame 10 of the animation.

Cheers

Mike
mik### [at] nacstockacuk

#include "colors.inc"
#include "textures.inc"

global_settings
{assumed_gamma 1.0}

// ----------------------------------------
//camera{location  <0.0, 0.5, -4.0> direction 1.5*z right     4/3*x
look_at   <0.0, 0.0,  0.0>}
//camera{location  <4, 0.5, 0.0> direction 1.5*z right     4/3*x
look_at   <0.0, 0.0,  0.0>}
camera{ location <3*sin(2*pi*clock),0,-3*cos(2*pi*clock)> look_at 0}

sky_sphere
{
  pigment
  {
    gradient y
    color_map { [0.0 color blue 0.6] [1.0 color rgb 1] }
  }
}

light_source
{
  0*x // light's position (translated below)
  color red 1.0  green 1.0  blue 1.0  // light's color
  translate <-30, 30, 30>
}

light_source
{
  0*x // light's position (translated below)
  color red 1.0  green 1.0  blue 1.0  // light's color
  translate <-30, 30, -30>
}

// ----------------------------------------
plane { y, -1 pigment {color rgb <0.7,0.5,0.3>}}

#declare logo=intersection{

height_field {
        tga "naclogoi.tga"
        smooth
        texture {Polished_Chrome}
        rotate <90,0,180>
        }
box
{
  <-1, -1, -1>
  < 1,  1,  1>
  scale <0.5, 0.5 .5>
  translate < -0.5,0.5,1>
}
}

object {logo
        texture{Polished_Chrome}
        rotate <0, 180, 0>
        translate <-.5,-.5,0>
}

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Attachments:
Download 'frame10.jpg' (17 KB) Download 'naclogo.jpg' (25 KB)

Preview of image 'frame10.jpg'

Preview of image 'naclogo.jpg'

Mike wrote:
> 
> Hi Folks
> 
> I'm trying to create a 3D logo from a flat black and white version. I've
> tried doing using a height field. When I render an animated sequence the
> logo looks like it's transparent at the sides. Does anyone know why?
> 
> Is there a better way of doing this? Here is the pov file and the
> original logo. Also frame 10 of the animation.
> 
> Cheers
> 
> Mike
> mik### [at] nacstockacuk


If you replace the chrome texture you have in two places with

  pigment { rgb 1 }
    finish { ambient .5 diffuse .5 }

and then render the scene you will find there is nothing wrong with
your logo object (I used the first camera to test this). You are the
victim of a highly reflective object and no more. If you are having
any real problems it is with the roughness you have on the objects
edges from a poor quality height field image. The lack of straight
edges in the image is giving you very rough edges in the HF object
and appears as if the edges have been chipped away.

  Please don't post binaries to this group in the future. Instead post
your question here and the source file in the povray.binaries.scene-files
group with a reference to it's location.


-- 
Ken Tyler

mailto://tylereng@pacbell.net

Post a reply to this message

P.S. You can avoid having to use an intersetion to create your
logo by simply using the HF ojbect as is and use the water_level
feature for HF's to rid yourself of the background.

-- 
Ken Tyler

mailto://tylereng@pacbell.net

Post a reply to this message

Opps, sorry about that! Thanks for the advice

Mike

Ken wrote:

>
>
>   Please don't post binaries to this group in the future. Instead post
> your question here and the source file in the povray.binaries.scene-files
> group with a reference to it's location.
>
> --
> Ken Tyler
>
> mailto://tylereng@pacbell.net

Post a reply to this message

Ahhh! Right. I'll try that. I knew that there had to be a simpler
solution.

Cheers

Mike

Ken wrote:

>   P.S. You can avoid having to use an intersetion to create your
> logo by simply using the HF ojbect as is and use the water_level
> feature for HF's to rid yourself of the background.
>
> --
> Ken Tyler
>
> mailto://tylereng@pacbell.net

Post a reply to this message

I actually have the original image as a vector based CorelXara image which can
be converted to CorelDraw easily enough. Can I use this in a 3D modelling
program and 'extrude' it somehow? That way I can avoid using bitmaps and
height fields etc. When I use a very high quality bitmap the file takes ages
to parse. This is a pain for animation type stuff because it happens for every
frame.

Cheers

Mike

Ken wrote:

> Mike wrote:
> >
> > Hi Folks
> >
> > I'm trying to create a 3D logo from a flat black and white version. I've
> > tried doing using a height field. When I render an animated sequence the
> > logo looks like it's transparent at the sides. Does anyone know why?
> >
> > Is there a better way of doing this? Here is the pov file and the
> > original logo. Also frame 10 of the animation.
> >
> > Cheers
> >
> > Mike
> > mik### [at] nacstockacuk
>
> If you replace the chrome texture you have in two places with
>
>   pigment { rgb 1 }
>     finish { ambient .5 diffuse .5 }
>
> and then render the scene you will find there is nothing wrong with
> your logo object (I used the first camera to test this). You are the
> victim of a highly reflective object and no more. If you are having
> any real problems it is with the roughness you have on the objects
> edges from a poor quality height field image. The lack of straight
> edges in the image is giving you very rough edges in the HF object
> and appears as if the edges have been chipped away.
>
>   Please don't post binaries to this group in the future. Instead post
> your question here and the source file in the povray.binaries.scene-files
> group with a reference to it's location.
>
> --
> Ken Tyler
>
> mailto://tylereng@pacbell.net

Post a reply to this message