Corona - Projection + Workaround

Corona Corona for 3ds Max General
1

Hello,
due to current corona limitation render to texture does not support “Projection” as part of this process. Simply ignoring the “Cage” and rendering over the surface.

I found a workaround that might be helpful to some of you, here it is:

(I’m sorry if its well-known thing and I’m just late to the party)

  • To do projection mapping all you need to do is create your regular retopology mesh as you would in normal conditions
  • Unwrap the mesh
  • Collapse it
  • Copy the mesh and start moving vertexes around just as you would with projection mesh, use push and regular vertex manipulation
  • Make sure that each element is covered by a new mesh cage just like you would with projection
  • Render to Texture - pick the elements that you desire
  • Use the rendered elements with Original Mesh

In my case, the effects are good enough to call this usable. So hope that it helps someone here :smiley:

mesh_u1_v2.jpg
mesh_u1_v2.jpg1200×600 70.6 KB

mesh_u1_v1.jpg
mesh_u1_v1.jpg1200×600 183 KB

2

But the “cage” mesh and the “original” mesh must have very similar unwrapping, right? I don’t think this is always possible.

3

If you commit the original UVW unwrap before you modify the cage it will behave exactly as Projection would as that’s how that modifier works.

So the result is identical

I edited my initial post.

4

Hey,
projection does not work at all for normals at this moment, something changed and it got impossible to create projection normal maps.

Any other way to render to texture? I would love to get some assistance on this topic if possible.

5

Unless for some reason it is absolutely necessary to use Corona, i would suggest to look for other tools for texture projection. There are plenty of dedicated tools that does much better job at that, some of them are even free.

6

Aww… that sucks I was hoping I was doing something wrong. :confused:

The render element normalmap should be removed from projection mapping since it does not work. I wanted two hours today figuring our what I was doing wrong.

Thank you for your answer Romullus

7

AFAIK projection baking was never supported by Corona, just old boring RTT.

8

But it somewhat worked, now it does not work at all. Or I cant figure it out, anyway. That’s a pickle, thank you!