custom Mesh texturing problems 2003-12-17 - By matse@(protected)
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Hi all,
I'm trying to create a plane mesh and texture it at runtime using Lingo,
because
I need planes with a centered pivot point AND Heigh/Width that can be defined
(scale is used to maintain aspect ratio whatever the distance from the camera
is).
So I found a solution that seemed quite simple to me : create a #plane
primitive
with the desired height/width, add a #meshDeform modifier on it and the use its
data to create a new mesh (I found that meshes had their pivot point
centered).
Mesh creation works great, trouble arises when it comes to texturing it... I
don't know why but I can't manage to get the texture properly on the mesh,
while it works perfectly with the default plane. The texture I'd like to
display comes from a text cast member, I thought maybe the problem was with the
alpha layer, but I have the same problem when I try to texture the mesh with a
bitmap without alpha... it's weird : the shader takes the color of the bitmap
but it seems like it displays just one pixel of it :/
What I mean here is if I create a 32*32 bitmap, fill it with grey, then add
some
red pixels on it I'll see the full bitmap when textured an a primitive plane,
but only grey when put on a mesh plane...
I hope I make myself understandable, I'm quite lost on this one... :/
here's my test code for the plane primitive :
-- ---- ---- ---- ---- ---- ---- ---- ---- --
tMember = member("scene")
tMember.resetWorld()
tResource = tMember.newModelResource("Billboard", #plane, #front)
tResource.widthVertices = 2
tResource.lengthVertices = 2
tResource.width = 100
tResource.length = 100
tModel = tMember.newModel("test", tResource)
tModel.transform.rotation = vector(180,0,180)
tTxt = new(#text)
tTxt.color = rgb(255,0,0)
tTxt.text = "blablabla"
tTxt.boxType = #fixed
tTxt.width = 128
tTxt.height = 128
tTex = tMember.newTexture("test", #fromCastMember, tTxt)
tModel.shader.texture = tTex
-- ---- ---- ---- ---- ---- ---- ---- ---- --
This one works perfectly on my system
And here is the code with the created mesh :
-- ---- ---- ---- ---- ---- ---- ---- ---- --
tMember = member("scene")
tMember.resetWorld()
tResource = tMember.newModelResource("Billboard", #plane, #front)
tResource.widthVertices = 2
tResource.lengthVertices = 2
tResource.width = 100
tResource.length = 100
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
-- Create new Mesh from Resource in order to center Pivot point
tModel = tMember.newModel("dummyTemp", tResource)
tModel.addModifier(#meshDeform)
tVertexList = tModel.meshDeform.mesh[1].vertexList
vertexCount = tModel.meshDeform.mesh[1].vertexList.count
faceCount = tModel.meshDeform.mesh[1].face.count
tFaceVertices = []
repeat with i = 1 to faceCount
tFaceVertices.add(tModel.meshDeform.mesh[1].face[i])
end repeat
-- destroy original Resource and Model
tMember.deleteModel(tModel.name)
tMember.deleteModelResource(tResource.name)
tMeshResource = tMember.newMesh("Billboard", faceCount, vertexCount)
tMeshResource.vertexList = tVertexList
repeat with i = 1 to faceCount
tMeshResource.face[i].vertices = tFaceVertices[i]
end repeat
tMeshResource.generateNormals(#smooth)
tMeshResource.build()
--/Create new Mesh from Resource in order to center Pivot point
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
tModel = tMember.newModel("test", tMeshResource)
tModel.transform.rotation = vector(180,0,180)
tTxt = new(#text)
tTxt.color = rgb(255,0,0)
tTxt.text = "blablabla"
tTxt.boxType = #fixed
tTxt.width = 128
tTxt.height = 128
tTex = tMember.newTexture("test", #fromCastMember, tTxt)
tModel.shader.texture = tTex
-- ---- ---- ---- ---- ---- ---- ---- ---- --
I'm quite new to the whole meshDeform/mesh creation stuff, so I must be missing
something obvious... I have quite the same problem in a level builder
application I'm developping, where I allow the user to set the shader for each
face of the Ground model : it works, but no texture displayed - it's like I was
only setting the shader's color :/
Any help greatly appreciated ! I cand send a small test movie to anyone
interested.
Please forgive any bad english ;)
Matse
http://www.newtgames.com
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