Hi Nick,
One way to improve this is to place your "root" somewhere near the
center of your instanced geometry and subtract the center from your
instances positions.
This way the coordinates to be multiplied stay small in relation (as the
big precision loss due to View*Model is done on the CPU side (during
cull) instead of multiplying big coordinates one the GPU with the inverse.
So decorate your CustomGeometry subgraph with a transform and modify
your instances position accordingly.
Hi Community,
me again on this. I have it working, however, it looks really bad when
using large coordinates (when placed on UTM or Geocentric). The model
is somewhat distorted due to precission issues. I know how to avoid
this, like working with double matrices, but when I pass double matrix
on the vertex shader it kills the performance - from 60Fps to ~1 fps.
Bellow is the vertex shader. Any hints?
Thanks a bunch as always
#version 150 compatibility
uniform mat4 osg_ModelViewProjectionMatrix;
uniform mat3 osg_NormalMatrix;
uniform vec3 lightDirection;
in vec3 vPosition;
in vec3 vNormal;
in vec2 vTexCoord;
in mat4 vInstanceModelMatrix;
smooth out vec2 texCoord;
smooth out vec3 normal;
smooth out vec3 lightDir;
void main()
{
gl_Position = /*osg_ModelViewProjectionMatrix*/
gl_ModelViewProjectionMatrix * vInstanceModelMatrix * vec4(vPosition,
1.0);
texCoord = vTexCoord;
mat3 instanceNormalMatrix = mat3(vInstanceModelMatrix[0][0],
vInstanceModelMatrix[0][1], vInstanceModelMatrix[0][2],
vInstanceModelMatrix[1][0], vInstanceModelMatrix[1][1],
vInstanceModelMatrix[1][2],
vInstanceModelMatrix[2][0], vInstanceModelMatrix[2][1],
vInstanceModelMatrix[2][2]);
normal = osg_NormalMatrix * instanceNormalMatrix * vNormal;
lightDir = lightDirection;
}
On Tue, Nov 25, 2014 at 12:06 PM, Robert Osfield
<[email protected] <mailto:[email protected]>> wrote:
Hi All,
On 24 November 2014 at 09:28, Sebastian Messerschmidt
<[email protected]
<mailto:[email protected]>> wrote:
The example I was looking for was in the submissions, called:
[osg-submissions] New example : culling and LODing performed
on GPU side
Unfortunately Robert didn't approve or merge the nescessary
changes. Maybe it went unnoticed.
I am still progressing through the submissions backlog and am
delighted to say that this wee gem of an example is now checked
into svn/trunk - look for osggpucull. I haven't had a chance to
spend the time understanding it yet, but the code is there.
Robert.
_______________________________________________
osg-users mailing list
[email protected]
<mailto:[email protected]>
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
--
trajce nikolov nick
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
