A way to display UV seams without using UV Unwrap modifier

sgv3dmax — Sat, 13 Feb 2021 18:37:25 GMT

Is there a way to display UV seams in viewport without using the unwrap modifier? It could be something like in X-view, but just the UV seams. It would be very helpful while modelling where the seams are very crucial. Thanks

Re: A way to display UV seams without using UV Unwrap modifier

Irshad_Shah_3dArtist — Tue, 16 Feb 2021 13:11:50 GMT

Hi Mate. You can do one thing after unwrapping the model just render the uv as a jpg. Then apply the rendered uv on the model.

This is the only way to work on the model while having the uv seems visible.

Hope this will help.

Thanks and Regards,

Irshad Shah

Re: A way to display UV seams without using UV Unwrap modifier

sgv3dmax — Tue, 16 Feb 2021 23:38:47 GMT

Hi Irshad, thank you for the reply. Yup, I can use render to texture and use that as a guide, but the problem is the changes I make to the model will not get updated, and I need real-time feedback when an edge is removed or added. I found this maxscript in scriptspot.com but it will not work in max 2021, which I am currently using. This script works without any problem in 2015 and 2017 and is very useful + it has real-time feedback when you click the Update button. Here is the script (Credit to PolyTools3D), screen shot attached. You can copy+paste it into max script window and run it to test:
macroScript Macro2
category:"DragAndDrop"
toolTip:""
(
(

unRegisterRedrawViewsCallback cbDrawOpenEdges

global RO_DISPLAY_UV_OE
global cbDrawOpenEdges
global cbSelectionChanged

local vertexPos = #()
local uvChannel = 1
local edgesColor = [0,255,0]
local edgeOffset = 0.03
local forceRedraw = false

fn cbDrawOpenEdges = (
gw.setTransform (Matrix3 1)
gw.setColor #line edgesColor
for j in vertexPos do gw.polyLine j true

-- Needed in some Max versions or used dirvers
if forceRedraw do (
gw.enlargeUpdateRect #whole
gw.updateScreen()
)
)

fn cbSelectionChanged mForce:false = (

unRegisterRedrawViewsCallback cbDrawOpenEdges

if ($ != undefined) do (

setwaitcursor()

st = timeStamp()

obj = snapshotasmesh selection[1]

allChannels = for j = 1 to meshop.getNumMaps obj where (meshop.getMapSupport obj j) collect j

RO_DISPLAY_UV_OE.ddl_channel.items = for j in allChannels collect j as string

if (mForce == false) do (
uvChannel = allChannels[1]
RO_DISPLAY_UV_OE.ddl_channel.selection = 1
)

numTFaces = meshop.getNumMapFaces obj uvChannel
numTVerts = meshop.getNumMapVerts obj uvChannel

facesTVertsIdx = for j = 1 to numTFaces collect (meshop.getMapFace obj uvChannel j)

emesh = trimesh()
setMesh emesh numverts:numTVerts numfaces:numTFaces
setMesh emesh faces:facesTVertsIdx

objOpenEdges = meshop.getOpenEdges obj
meshOpenEdges = (meshop.getOpenEdges emesh) - objOpenEdges

vertexPos = #()

sharedFaces = meshop.getFacesUsingEdge emesh meshOpenEdges
foundEdges = #()

for j in sharedFaces do (

objFaceVerts = getFace obj j

edge1 = j*3 - 2
edge2 = j*3 - 1
edge3 = j*3

n1 = (getFaceNormal obj j) * edgeOffset

if (finditem meshOpenEdges edge1) > 0 do (
v1Idx = objFaceVerts.x
v2Idx = objFaceVerts.y
if (findItem foundEdges [v1Idx, v2Idx] == 0) do (
v1 = getVert obj v1Idx
v2 = getVert obj v2Idx
n3 = (normalize (cross n1 (v1-v2))) * edgeOffset
append vertexPos #(v1+n1+n3, v2+n1+n3, v1-n1-n3, v2-n1-n3, v1-n1+n3, v2-n1+n3, v1+n1-n3, v2+n1-n3)
append foundEdges [v2Idx, v1Idx]
)
)
if (finditem meshOpenEdges edge2) > 0 do (
v1Idx = objFaceVerts.y
v2Idx = objFaceVerts.z
if (findItem foundEdges [v1Idx, v2Idx] == 0) do (
v1 = getVert obj v1Idx
v2 = getVert obj v2Idx
n3 = (normalize (cross n1 (v1-v2))) * edgeOffset
append vertexPos #(v1+n1+n3, v2+n1+n3, v1-n1-n3, v2-n1-n3, v1-n1+n3, v2-n1+n3, v1+n1-n3, v2+n1-n3)
append foundEdges [v2Idx, v1Idx]
)
)
if (finditem meshOpenEdges edge3) > 0 do (
v1Idx = objFaceVerts.z
v2Idx = objFaceVerts.x
if (findItem foundEdges [v1Idx, v2Idx] == 0) do (
v1 = getVert obj v1Idx
v2 = getVert obj v2Idx
n3 = (normalize (cross n1 (v1-v2))) * edgeOffset
append vertexPos #(v1+n1+n3, v2+n1+n3, v1-n1-n3, v2-n1-n3, v1-n1+n3, v2-n1+n3, v1+n1-n3, v2+n1-n3)
append foundEdges [v2Idx, v1Idx]
)
)

)

sharedFaces = meshop.getFacesUsingEdge obj objOpenEdges

for j in sharedFaces do (

objFaceVerts = getFace obj j

edge1 = j*3 - 2
edge2 = j*3 - 1
edge3 = j*3

n1 = (getFaceNormal obj j) * edgeOffset

if (finditem objOpenEdges edge1) > 0 do (
v1Idx = objFaceVerts.x
v2Idx = objFaceVerts.y
v1 = getVert obj v1Idx
v2 = getVert obj v2Idx
n3 = (normalize (cross n1 (v1-v2))) * edgeOffset
append vertexPos #(v1+n1+n3, v2+n1+n3, v1-n1-n3, v2-n1-n3, v1-n1+n3, v2-n1+n3, v1+n1-n3, v2+n1-n3)
)
if (finditem objOpenEdges edge2) > 0 do (
v1Idx = objFaceVerts.y
v2Idx = objFaceVerts.z
v1 = getVert obj v1Idx
v2 = getVert obj v2Idx
n3 = (normalize (cross n1 (v1-v2))) * edgeOffset
append vertexPos #(v1+n1+n3, v2+n1+n3, v1-n1-n3, v2-n1-n3, v1-n1+n3, v2-n1+n3, v1+n1-n3, v2+n1-n3)
)
if (finditem objOpenEdges edge3) > 0 do (
v1Idx = objFaceVerts.z
v2Idx = objFaceVerts.x
v1 = getVert obj v1Idx
v2 = getVert obj v2Idx
n3 = (normalize (cross n1 (v1-v2))) * edgeOffset
append vertexPos #(v1+n1+n3, v2+n1+n3, v1-n1-n3, v2-n1-n3, v1-n1+n3, v2-n1+n3, v1+n1-n3, v2+n1-n3)
)

)

format "Found %\tUV Open Edges in %s\n" vertexPos.count ((timeStamp() - st) / 1000.0)

registerRedrawViewsCallback cbDrawOpenEdges

delete obj
delete emesh

gc light:true

setArrowCursor()

)

forceCompleteRedraw()

)

try(destroyDialog RO_DISPLAY_UV_OE) catch()
rollout RO_DISPLAY_UV_OE "UV Open Edges" width:160 height:198
(
checkbutton bt_enable "Display UV Open Edges" pos:[8,8] width:144 height:32
dropdownList ddl_channel "UV Channel:" pos:[8,72] width:120 height:40 enabled:false
colorPicker cp1 "" pos:[131,90] width:21 height:21 enabled:true color:edgesColor modal:false
checkbox chk_redraw "Force Redraw" pos:[8,46] width:100 height:16 enabled:false
spinner spn_width "Edge Width:" pos:[8,120] width:120 height:16 range:[1,100,4] type:#integer fieldwidth:50
button bt_update "Update" pos:[8,160] width:144 height:28 enabled:false

fn destroy = (
callbacks.removeScripts #selectionSetChanged
unRegisterRedrawViewsCallback cbDrawOpenEdges
forceCompleteRedraw()
)

on RO_DISPLAY_UV_OE close do destroy()

on bt_enable changed arg do
(
bt_update.enabled = arg
ddl_channel.enabled = arg
chk_redraw.enabled = arg
destroy()

if (arg == true) do (
callbacks.addscript #selectionSetChanged "cbSelectionChanged()"
cbSelectionChanged()
)
)

on bt_update pressed do cbSelectionChanged()

on ddl_channel selected arg do (
uvChannel = (ddl_channel.selected as integer)
cbSelectionChanged mForce:true
)

on cp1 changed arg do edgesColor = arg

on spn_width changed arg do edgeOffset = (arg-1)/100.0

on chk_redraw changed arg do forceRedraw = arg

)

createDialog RO_DISPLAY_UV_OE

)
)

topic Re: A way to display UV seams without using UV Unwrap modifier in 3ds Max Modeling Forum

A way to display UV seams without using UV Unwrap modifier

Re: A way to display UV seams without using UV Unwrap modifier

Re: A way to display UV seams without using UV Unwrap modifier