Im an iPhone developer and i'm trying to get a 3D model that I create in Cinema 4D into an app im making. I have actually found a way to get the model in (by exporting it as a .dae or obj and using a python script) which works really well however I can't get the textures to come with it. My script actually can only handle 1 texture as well.
Basically I need to ether create and export a UV map in c4d (but I have no idea how to do this) or I figure out a way to read multiple textures into my Open Gl - ES app with a script or PowerVR. (this is probably better)
Sorry for the noob questions but im very new at the 3D world.
Cheers
I would recommend that you use Blender. Export your Cinema-4D model for Blender and use Blender to create UVMaps.
You need to make seams and unwrap the model. After that save a targa template for your texture, apply your texture on that targa. Save it as png or jpg. Apply that texture image to your model in Blender. Now you can export Wavefront OBJ file.
Use OpenGLOBJLoader class to render your model in iPhone.
And one more thing: you should invert (subtract from 1) texture coordinates on y axis in order to get your texture rendered properly.
For example, if you have texture coordinates like this:
vt 0.800008 0.400000
vt 0.800008 0.150000
...
make sure that you have them inverted like this:
vt 0.800008 0.600000
vt 0.800008 0.850000
...
Related
I have a point-cloud and a rgb texture that fit together from a depth camera. I procedurally created a mesh from a selected part of the point-cloud implementing the quickhull 3D algorithm for mesh creation.
Now, somehow I need to apply the texture that I have to that mesh. Note that there can be multiple selected parts of the point-cloud thus making multiple objects that need the texture. The texture is just a basic 720p file that should be applied to the mesh material.
Basically I have to do this: https://www.andreasjakl.com/capturing-3d-point-cloud-intel-realsense-converting-mesh-meshlab/ but inside Unity. (I'm also using a RealSense camera)
I tried with a decal shader but the result is not precise. The UV map is completely twisted from the creation process, and I'm not sure how to generate a correct one.
UV and the mesh
I only have two ideas but don't really know if they'll work/how to do them.
Try to create a correct UV and then wrap the texture around somehow
Somehow bake colors to vertices and then use vertex colors to create the desired effect.
What other things could I try?
I'm working on quite a similar problem. But in my case I just want to create a complete mesh from the point cloud. Not just a quickhull, because I don't want to lose any depth information.
I'm nearly done with the mesh algorithm (just need to do some optimizations). Quite challenging now is to match the RGB camera's texture with the depth camera sensor's point cloud, because they of course have a different viewport.
Intel RealSense provides an interesting whitepaper about this problem and as far as I know the SDK corrects these different perspectives with uv mapping and provides a red/green uv map stream for your shader.
Maybe the short report can help you out. Here's the link. I'm also very interested in what you are doing. Please keep us up to date.
Regards
First of all , this image is my 3d model that I imported into unity3d :
Why this happening ?
In MAYA software this line is not appear but when I import this model into unity3d , the model seems like the above image.
what I guessing is , my 3d model UVs are overlapping together , and because of saving the texture size and getting better quality I set them like this image :
Is there anyway to fix this issue in Unity3D without changing the UV's ?
I suspect the line results from the models phong setting.
You can try to overwrite it in the Import Settings of the model: Just play around with the Smoothing Angle. Perhaps you have to adjust the Smoothness Source too.
In my game, I modify mesh at runtime using a damage algorithm.
After that, I would like to save them.
I get all meshes with:
MeshFilter[] meshfilters = MyObject.GetComponentsInChildren<MeshFilter>();
then i modify single mesh.
How to save that in my original FBX file ?
Thanks
Unity's internal mesh type is not the same as an FBX, FBX is a file storage format, while Unity uses a different internal structure at runtime, for greater efficiency.
As far as I know there is no standard way to save out a runtime mesh as an FBX (this is a feature of 3D modelling software, not a game engine)
You can save your deformations somehow and re-apply them when you reload the model, when I did a similar thing (custom generated terrain meshes at runtime) I would generate a mesh at runtime, then save the data required to generate that mesh, then pass it into the same flow I used to generate the mesh in the first place.
It is possible to serialise meshdata in the unity editor as meshdata is actually a different format from FBX (Unity reads an FBX, then generates a mesh asset from the FBX's data, then associates that mesh with the FBX) You do this by playing with AssetDatabase.CreateAsset() https://docs.unity3d.com/ScriptReference/AssetDatabase.CreateAsset.html
But I don't think this is what you're intending to do.
If you want the full FBX suite of features (skinning, animation, use in other unity projects) and you want them at runtime, you don't really have any options that I know of. Short of implementing your own FBX serialisation library (not really a reasonable solution)
I would like to create a texture map for a 3D car model I have. I am not sure where to start. I thought maybe I could unwrap the 3D object to a 2D image and then use this as an outline to draw my texture. Is this possible, or is there a simpler solution?
Thank you in advance!
I would like to create a texture map for a 3D car model I have. I am not sure where to start
What you are asking about is called UV mapping.
"UV mapping is the 3D modeling process of projecting a 2D image to a 3D model's surface for texture mapping."
Source: https://en.wikipedia.org/wiki/UV_mapping
UV mapping is normally done when creating the model in 3d modelling software, although there may be assets in Unity able to do the same. To my knowledge Unity is not able to directly UV map.
You can however, change the texture of an object inside Unity as well as assign objects various colours and materials.
maybe I could unwrap the 3D object to a 2D image and then use this as an outline to draw my texture
To my knowledge you need 3d modelling software to do so, but yes, it is possible.
You can try to change it through scripting, but I'd recommend looking into 3d modelling software instead as I believe that if it is possible it will be bothersome.
3D modelling software I know of:
Blender - Free
Maya - Licensed
3DS Max - Licensed
I have a problem with importing 3D model from FBX file.
Source model contains 575 objects + 1 camera and looks like this: http://habreffect.ru/files/23d/542fa7f67/source_model.png
In XNA prepared with content pipeline model contains 82 meshes, and 576 bones.
So, when I draw my model, I see only part of source model. Result picture like following:
http://habreffect.ru/files/28a/6e61c0215/Result_view.png
My drawing code:
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] transforms = new Matrix[_model.Bones.Count];
_model.CopyAbsoluteBoneTransformsTo(transforms);
foreach (var mesh in _model.Meshes)
{
foreach (BasicEffect effect in mesh.Effects)
{
effect.LightingEnabled = true;
effect.EnableDefaultLighting();
effect.World = transforms[mesh.ParentBone.Index] * _world;
effect.View = _view;
effect.Projection = _proj;
}
mesh.Draw();
}
base.Draw(gameTime);
How can I get all 575 meshes in my Model instance in XNA?
Thanks!
UPD: I tried to import my FBX model to 3ds max, select all meshes and use "Export selected". Result FBX file is 11x bigger. Then I add it as content to XNA project, loaded model contains all 575 meshes, and it rendered correctly.
Unfortunately, this manual converting method don't suit me - I need to render varied fbx models from mutable repository.
So, what FBX file are "good" for XNA content processor (I use XNA 4)?
So, on MSDN I found that FbxImporter designed to work with 2006.11 version of FBX format.
Recently Autodesk released FBX Converter 2012.1, which contains other tools, like FBX Eplorer, FBX Viewer.
FBX explorer can show structure of FBX file, and I compare exported from 3D MAX file, and source FBX file. They have different internal format. I tried to make following conversion: FBX -> Collada -> FBX, and the result FBX file contains similar to exported from MAX data structure.
So, I simply add the result FBX to Content of my XNA app, and it's rendered well :)
Another way to make it work is to use Autodesk FBX SDK to manually read model, and draw it in XNA.
Conclusion:
XNA FbxImporter correct work doesn't depend on version (2006, 2011, etc) and form (binary, ascii) of FBX file. Internal FBX data structure much more important.
To make FBX "readable" for XNA Importer you can use double conversion like FBX -> Collada -> FBX
You also can use FBX SDK to manually load data from FBX
Open the 3d model in latest 3dx max 2012 and export it in .fbx format. This .fbx is loaded properly with the xna model loader. While exporting you can even embed the resources, so you dont have to add textures to it through XNA.
You are using instancing in 3DS MAX. This isn't supported directly by XNA.
You have to draw the mesh for each instance bone yourself.
Ideally you would instead use DirectX instancing to draw each mesh once per bone in a single Draw() call.
But you have to roll your own code to do that, by converting the bones into instance vertices.
By default XNA only supports the most basic operations.