Section 1 Lesson 15 Challenge question

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Hello all, I’m new to blender and to the 3d world in general.
I work as a graphic designer, mostly on cosmetic products that’s why I’d like to upgrade my skills and create my own models and renders.

QUESTION: why the lights hit the cylinder and the U.V. sphere that I turned into a single object like they were still different objects?

Thankss

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Hi Lorenzo,

Is this for one of your Unity projects? Or is it a Blender project?

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Hi Nina, this is a blender project. Did I post in the wrong section? Sorry I’m new to the forum…

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I think the issue here is that even though the joining of the objects does create a single object there are still two seperate meshes in this object. This does create the hard line when you turn on smooth shading here, since that feature works on a mesh basis.

To fix this you need to use the edit mode of the blender. To go there you use the TAB button. Once there press 3 to select the faces mode of the edit mode. Then click any of the faces on the lower part of the bottle and pres CTRL + L to select all parts of that mesh. You can then move that downwards with G and then pressing Z, so that it is out of the way for the next part. Now press Alt + A to unselect everything and go to wireframe mode with Z.Then in the next step drag a box around the lower half of the sphere, so that all of its faces are selected. Now press X and say delete faces. Now go back to the lower cylinder and select its top face that is facing the half sphere. Also delete that. Now you take the whole lower part again and move it back into position, so that it is as close to the sphere as possible. Now press 2 to go to the Edge mode and zoom in on the area between the cyclinder and the sphere. Now press Alt + Left Click on the on one lower edges of the sphere. You now selected an Edge Loop. Now hold Shift and press Alt + Left Click on the edge loop on the top of the cylinder. You now should have both selected at the same time. Then you can right click and select the “bridge edge loop” option. This is the part that now actually joins the two seperate parts into one. Unfortunately this still does not look as expected due to the way smooth shading works :wink: But now you can select one of the edge loops you joined before, press X again and tell it to delete the edge loop. Now you got only one edge loop left at the joint and smooth shading works as expected.

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That’s absolutely fine. I moved your thread to the correct subcategory for you so. :slight_smile:

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Morning Lorenzo,
I suspect that dadriel is correct in regards to the problem being that you have two meshes sharing 1 object. However, there is a much simpler way to fix this.

  1. switch to either the front [num1] or side [num3] view and an orthographic view [num5]. (note: if you’ve enabled auto orthographic view in preferences you don’t need to switch manually)
  2. Enter ‘Edit Mode’ [TAB] and clear your selection [Alt] + [A]. (if you enabled ‘A Key toggles’ in preferences use [A] [A])
  3. Switch to ‘Wireframe View’: [Ctrl] + [Z]
  4. Switch to ‘Vertex Select’ [1] and draw a box around the ring of vertices comprising the top of your cylinder and the equator of your sphere.
  5. Merge selected vertices; [Alt]+[M] —> Merge by Distance.
  6. Switch to ‘Face Select’ [3]
  7. Navigate: Select —> Select by type —> Interior Faces
  8. Delete the now selected faces: [ X ] —> Delete Faces

Updated Tue Aug 06 2019 09:53
edited to add switching to wireframe

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Thank you for pointing out the quicker way. I’m also still new to blender and just found the way I described by playing around with the options. I just tried your way and it is indeed much quicker. Only the option to select the interior faces does not seem to work quite right. It selects the top face of the cyclinder just fine after the merge, but the lower half of the sphere is not selected by it. Is there mayber another option that I’m missing there?

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Just tried it myself and was surprised that it refused to select the interior faces that were part of the sphere. As I haven’t checked for a new version this week I’m not sure if that’s a bug or intentional.

In any event, to remove those faces

  1. Switch to ‘Edge Select’ [2] and select the first edge-loop below the merged vertices and delete it. [Alt] + [select] then [ X ] —> delete vertices
  2. Press [A] to select everything
  3. Place the mouse over the portion of the mesh you want to keep and deselect that part: [Shift] + [L] repeat until left with only what you want to delete. (this is easiest in ‘Face Select’ mode)
  4. Delete the unwanted geometry
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Thanks, with that procedure it now worked to delete the interiror faces of the sphere also.

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Thank you guys, problem solved!

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