[vtkusers] Error in vtkOpenGLGPUVolumeRayCastMapper.cxx, continued

[Aashish Chaudhary]

Rick,

Can you send me information on what you are turning on in volume property
and in mapper that leads to this crash? Also, is your data is single or 2
or 4 component?

Thanks,


On Sun, Apr 3, 2016 at 9:25 PM, Richard Frank <rickfrank at me.com> wrote:

> Further investigation seems to point the GradientOpacity section of shader
>  raycasterfs.glsl, code which seems to be inserted at runtime: I guess
> gl_aspect is not defined in this scenario?
>
> Any suggestions welcome!
>
> Rick
>
> vec4 computeGradient()
> 145: {
> 146: vec3 g1;
> 147: vec4 g2;
> 148: g1.x = texture3D(in_volume, vec3(g_dataPos + g_xvec)).x;
> 149: g1.y = texture3D(in_volume, vec3(g_dataPos + g_yvec)).x;
> 150: g1.z = texture3D(in_volume, vec3(g_dataPos + g_zvec)).x;
> 151: g2.x = texture3D(in_volume, vec3(g_dataPos - g_xvec)).x;
> 152: g2.y = texture3D(in_volume, vec3(g_dataPos - g_yvec)).x;
> 153: g2.z = texture3D(in_volume, vec3(g_dataPos - g_zvec)).x;
> 154: g1 = g1*in_volume_scale.r + in_volume_bias.r;
> 155: g2 = g2*in_volume_scale.r + in_volume_bias.r;
> 156: g1.x = in_scalarsRange[0] + (
> 157: in_scalarsRange[1] - in_scalarsRange[0]) * g1.x;
> 158: g1.y = in_scalarsRange[0] + (
> 159: in_scalarsRange[1] - in_scalarsRange[0]) * g1.y;
> 160: g1.z = in_scalarsRange[0] + (
> 161: in_scalarsRange[1] - in_scalarsRange[0]) * g1.z;
> 162: g2.x = in_scalarsRange[0] + (
> 163: in_scalarsRange[1] - in_scalarsRange[0]) * g2.x;
> 164: g2.y = in_scalarsRange[0] + (
> 165: in_scalarsRange[1] - in_scalarsRange[0]) * g2.y;
> 166: g2.z = in_scalarsRange[0] + (
> 167: in_scalarsRange[1] - in_scalarsRange[0]) * g2.z;
> 168: g2.xyz = g1 - g2.xyz;
> 169: g2.x /= g_aspect.x;
> 170: g2.y /= g_aspect.y;
> 171: g2.z /= g_aspect.z;
> 172: float grad_mag = sqrt(g2.x * g2.x +
> 173: g2.y * g2.y +
> 174: g2.z * g2.z);
> 175: if (grad_mag > 0.0)
> 176: {
> 177: g2.x /= grad_mag;
> 178: g2.y /= grad_mag;
> 179: g2.z /= grad_mag;
> 180: }
> 181: else
> 182: {
> 183: g2.xyz = vec3(0.0, 0.0, 0.0);
> 184: }
> 185: grad_mag = grad_mag * 1.0 / (0.25 * (in_scalarsRange[1] -
> 186: (in_scalarsRange[0])));
> 187: grad_mag = clamp(grad_mag, 0.0, 1.0);
> 188: g2.w = grad_mag;
> 189: return g2;
> 190: }
>
>
>
>
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-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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