Plz help,
when i try to render the image it renders with black lines at the joints.
i am using blender 2.78 version(cycles)
Can you post a minimal, stripped down .blend file that demonstrates the issue?
someone please help
There is something seriously wrong with your mesh, with all that Z-fighting. It looks as though you may have several objects overlapping each other.
Thank you for the upload.
What you’re seeing is a precision issue. Those concave corner artefacts, and the viewport drawing issues that are evident in perspective mode, seem to be linked to the vast scale of the scene. The objects are huge, and are at an extreme distance from the centre origin. It looks like the model was imported from another package, and the scale and location have suffered during the import process.
The rendering artefacts can be eliminated by moving the model closer to the centre origin (see before - after), and the viewport drawing artefacts in Solid/Textured perspective mode are no longer present when the model’s size is reduced to something more sensible (see before - after).
It’s worth referring to the working limits documentation.