Add a good default UV map to our 'monkey' primitive. #47488

New Issue

Bastien Montagne · 2016-02-19T12:17:24+01:00

Bastien Montagne commented

2016-02-19 12:17:24 +01:00

We now have the option when creating a new mesh primitive to add a default UV map - but the monkey head has none currently.

This map cannot be procedurally generated like the other, once agreed on it should be hard-coded into the code, in a similar way to how the monkey geometry already is.

This project has 2 parts:

Create the new UV layout.
Add a fixed UV layout as an option for this primitive (see related commit 3c6709a63c)

We now have the option when creating a new mesh primitive to add a default UV map - but the monkey head has none currently. This map cannot be procedurally generated like the other, once agreed on it should be hard-coded into the code, in a similar way to how the monkey geometry already is. This project has 2 parts: - Create the new UV layout. - Add a fixed UV layout as an option for this primitive (see related commit 3c6709a63c)

Bastien Montagne commented

2016-02-19 12:17:24 +01:00

Changed status to: 'Open'

Bastien Montagne commented

2016-02-19 12:17:24 +01:00

Added subscriber: @mont29

Abhishek Kumar commented

2016-03-01 17:18:37 +01:00

Added subscriber: @abhishek12123

Abhishek Kumar commented

2016-03-01 17:18:46 +01:00

Removed subscriber: @abhishek12123

Robert Fornof commented

2016-05-30 18:01:54 +02:00

Added subscriber: @amdbcg

Robert Fornof commented

2016-05-30 18:01:54 +02:00

Who wants to go first? how are these UVs supposed to be generated? Should I put together seams around the eyes , mouth, ears, and get feedback from that?

Kush Singh commented

2016-06-17 01:59:57 +02:00

Added subscriber: @major_rascal

Kush Singh commented

2016-06-17 02:25:27 +02:00

hi, i wanted to make my first contribution to blender , i know about uv mapping and coding (c++) ...could i be of any help :)

Campbell Barton commented

2016-06-17 08:36:44 +02:00

Added subscriber: @ideasman42

Campbell Barton commented

2016-06-17 08:36:44 +02:00

If anyone likes to work on this, just go ahead, no need to ask first.
Check 3c6709a63c which adds UV's to other primitives (a useful reference to see related code).

If anyone likes to work on this, just go ahead, no need to ask first. Check 3c6709a63c which adds UV's to other primitives (a useful reference to see related code).

Chau commented

2016-07-07 06:11:45 +02:00

Added subscriber: @ChauHo

Chau commented

2016-07-07 06:11:45 +02:00

Youtube video from Mysticduder have nice mesh pattern below. I people like this pattern I will make it symmetric and get coordinate for all points. Please tell me your ideas about it. Thaks!

Youtube video from Mysticduder have nice mesh pattern below. I people like this pattern I will make it symmetric and get coordinate for all points. Please tell me your ideas about it. Thaks!![ConKỷ.png](https://archive.blender.org/developer/F319921/ConKy_.png)

peter lu commented

2016-08-26 20:12:57 +02:00

Added subscriber: @pdlla

peter lu self-assigned this 2016-08-26 20:12:57 +02:00

peter lu commented

2016-08-26 20:12:57 +02:00

Hi, first time here. I'm assuming no one is working on this anymore? I'm giving this a shot :). Will also look into fixing default unwrap for the UV sphere. Someone on IRC mentioned it "looks like a truck ran over it" and suggested I start there. I didn't see a tasks for this though.

Vuk Gardašević commented

2016-08-26 22:22:34 +02:00

Added subscriber: @VukGardasevic

Vuk Gardašević commented

2016-08-26 22:22:34 +02:00

In #47488#388098, @pdlla wrote:
Hi, first time here. I'm assuming no one is working on this anymore? I'm giving this a shot :). Will also look into fixing default unwrap for the UV sphere. Someone on IRC mentioned it "looks like a truck ran over it" and suggested I start there. I didn't see a tasks for this though.

There is a task were the UV sphere is mentioned. It's #47478

> In #47488#388098, @pdlla wrote: > Hi, first time here. I'm assuming no one is working on this anymore? I'm giving this a shot :). Will also look into fixing default unwrap for the UV sphere. Someone on IRC mentioned it "looks like a truck ran over it" and suggested I start there. I didn't see a tasks for this though. There is a task were the UV sphere is mentioned. It's #47478

Chau commented

2016-09-06 06:09:14 +02:00

Here is high resolution map with symmetry for monkey head. Please tell me your ideas guys. If happy with this I will finish clean up and list coordinates for all points.
PNG file:

SVG file (Inkscape):

Here is high resolution map with symmetry for monkey head. Please tell me your ideas guys. If happy with this I will finish clean up and list coordinates for all points. PNG file: ![ConKỷ.png](https://archive.blender.org/developer/F354074/ConKy_.png) SVG file (Inkscape): ![ConKỷ.svg](https://archive.blender.org/developer/F354076/ConKy_.svg)

peter lu commented

2016-09-06 06:37:23 +02:00

In #47488#390117, @ChauHo wrote:
Here is high resolution map with symmetry for monkey head. Please tell me your ideas guys. If happy with this I will finish clean up and list coordinates for all points.
PNG file:

SVG file (Inkscape):

Do you happen to have an screen cap of the seams that generated that map? (assuming it was done using unwrap in Blender)

> In #47488#390117, @ChauHo wrote: > Here is high resolution map with symmetry for monkey head. Please tell me your ideas guys. If happy with this I will finish clean up and list coordinates for all points. > PNG file: > ![ConKỷ.png](https://archive.blender.org/developer/F354074/ConKy_.png) > > SVG file (Inkscape): > ![ConKỷ.svg](https://archive.blender.org/developer/F354076/ConKy_.svg) Do you happen to have an screen cap of the seams that generated that map? (assuming it was done using unwrap in Blender)

Chau commented

2016-09-06 15:27:42 +02:00

I get pattern from this video from Mystic Duder:
https://www.youtube.com/watch?v=vu2jZwRmz1o

Blend. file with seams:
conKỷ.blend

I get pattern from this video from Mystic Duder: https://www.youtube.com/watch?v=vu2jZwRmz1o Blend. file with seams: [conKỷ.blend](https://archive.blender.org/developer/F354396/conKy_.blend)

peter lu commented

2016-09-08 19:45:15 +02:00

@ChauHo

Thanks! I'm using these UVs now.

I modified the unwrap operation to output its UVs for the purpose of hardcoding Suzanne's UV map. I pasted the code below for my own reference since it's not something that should be in the code base.

(oddly enough, since the UVs are already there, I output them before the actual unwrapping, which makes the fact that this is in the unwrap function pretty arbitrary)

static int unwrap_exec(bContext *C, wmOperator *op){
...
    BMesh* bm = em->bm;
    const int cd_loop_uv_offset = CustomData_get_offset(&bm->ldata, CD_MLOOPUV);
    BMFace *f;
    BMIter iter,iter2;
    int find = 0;
    BM_ITER_MESH (f, &iter, bm, BM_FACES_OF_MESH) {
        BMLoop *l;
        int loop_index;
        int vind = 0;
        BM_ITER_ELEM_INDEX (l, &iter2, f, BM_LOOPS_OF_FACE, loop_index) {
            MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
            printf("%ff,%ff,",luv->uv[0],luv->uv[1]);
            vind++;
        }
        find++;
        printf("\n");
    }

@ChauHo Thanks! I'm using these UVs now. ![Screen Shot 2016-09-08 at 10.43.22 AM.png](https://archive.blender.org/developer/F356241/Screen_Shot_2016-09-08_at_10.43.22_AM.png) ----------------- I modified the unwrap operation to output its UVs for the purpose of hardcoding Suzanne's UV map. I pasted the code below for my own reference since it's not something that should be in the code base. (oddly enough, since the UVs are already there, I output them before the actual unwrapping, which makes the fact that this is in the unwrap function pretty arbitrary) ``` static int unwrap_exec(bContext *C, wmOperator *op){ ... BMesh* bm = em->bm; const int cd_loop_uv_offset = CustomData_get_offset(&bm->ldata, CD_MLOOPUV); BMFace *f; BMIter iter,iter2; int find = 0; BM_ITER_MESH (f, &iter, bm, BM_FACES_OF_MESH) { BMLoop *l; int loop_index; int vind = 0; BM_ITER_ELEM_INDEX (l, &iter2, f, BM_LOOPS_OF_FACE, loop_index) { MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset); printf("%ff,%ff,",luv->uv[0],luv->uv[1]); vind++; } find++; printf("\n"); } ```

peter lu commented

2016-09-08 20:40:32 +02:00

This would be ready to go except the face or loop order of the monkey seems to change in the following conditions:

enter edit mode with a mesh that has many* UVs
delete some geometry with UVs
while still in edit mode, add Monkey
observe UVs are messed up.

*many here meaning > 20 tris but <= 60 tris and I know this because when adding deleting an icosphere with no subdivisions everything is ok, but breaks when subdividing once or more.

The weird part is I'm using the same code to generate the icosphere UVs and they work fine under the same conditions. The only difference is there are 20x 3 vertex faces in the icosphere versus 500x 3-4 vertex quads in the monkey.

To clarify, I have the monkey and icosphere UVs hardcoded. I iterate through each face of mesh and each loop of face and set the UVs when the primitives are created. The UVs are hard coded to this iteration order.

Well, I'll investigate more tomorrow. In the meantime, does anyone have any ideas? I'm getting the hang of how edit mode and bmeshes work but still overall pretty unfamiliar.

This would be ready to go except the face or loop order of the monkey seems to change in the following conditions: - enter edit mode with a mesh that has many* UVs - delete some geometry with UVs - while still in edit mode, add Monkey - observe UVs are messed up. *many here meaning > 20 tris but <= 60 tris and I know this because when adding deleting an icosphere with no subdivisions everything is ok, but breaks when subdividing once or more. The weird part is I'm using the same code to generate the icosphere UVs and they work fine under the same conditions. The only difference is there are 20x 3 vertex faces in the icosphere versus 500x 3-4 vertex quads in the monkey. To clarify, I have the monkey and icosphere UVs hardcoded. I iterate through each face of mesh and each loop of face and set the UVs when the primitives are created. The UVs are hard coded to this iteration order. Well, I'll investigate more tomorrow. In the meantime, does anyone have any ideas? I'm getting the hang of how edit mode and bmeshes work but still overall pretty unfamiliar. ![Screen Shot 2016-09-08 at 11.20.30 AM.png](https://archive.blender.org/developer/F356252/Screen_Shot_2016-09-08_at_11.20.30_AM.png)

peter lu commented

2016-09-09 18:52:48 +02:00

I set the UVs right after each face is created rather then after all faces are created and assuming the iteration order does not change. Apparently it does change in some circumstances. This works fine now in all conditions I tested it under but the code isn't quite as nice :(.

blender-admin commented

2016-09-24 16:08:10 +02:00

This issue was referenced by a070a5befa

This issue was referenced by a070a5befa1110120547333d84c6e67cae53d648

Brecht Van Lommel commented

2016-09-24 16:40:44 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2016-09-24 16:40:44 +02:00

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Add a good default UV map to our 'monkey' primitive. #47488