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When I use buffer offset in glDrawElements there are bugs: some new triangles appear in the screen.
A snippet of code with usage of Buffer offset .
gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, VBOs.get(Meshes.size() + i));
long offset = 0;
for (int j = 0; j < 2; j++) {
List<Face> FaceAssignedMaterial = Meshes.get(i).MaterialMaps.get(j).FaceAssignedMaterial;
gl.glDrawElements(GL2.GL_TRIANGLES, FaceAssignedMaterial.size() * 3, GL2.GL_UNSIGNED_INT, offset);
offset += FaceAssignedMaterial.size() * 3;
}
gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, 0);
gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, 0);
But when I replace the snippet above by this:
gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, VBOs.get(Meshes.size() + i));
long offset = 0;
for (int j = 0; j < 2; j++) {
List<Face> FaceAssignedMaterial = Meshes.get(i).MaterialMaps.get(j).FaceAssignedMaterial;
offset += FaceAssignedMaterial.size() * 3;
}
gl.glDrawElements(GL2.GL_TRIANGLES, Meshes.get(i).Faces.size() * 3, GL2.GL_UNSIGNED_INT, (long) (0));
gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, 0);
gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, 0);
I have watched the length of rendering elements in the both cases in Debuge mode, but the lengths are equal. I have wtched all I can, I have done all tests, this is something unbelievable.
Was somebody confronted by such problems?
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