Questions tagged [assimp]

open ASSet IMPort library(ASSIMP) is a portable Open Source library to import various well-known 3D model formats

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11 views

OpenGL obj loader fails to work

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20 views

How to export models with multiple animations using assimp

I'm implementing a model viewer that allows for preview and minor editing of a game's 3d model assets (custom model format). I've been searching on the net, and I see that 90% of the use of assimp is ...
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1answer
33 views

No local transform with skinned mesh with assimp?

I'm trying to add skeletal animation to my engine and I'm importing meshes with assimp, but I think I misunderstood the skinned mesh concepts (or don't understand assimp). When I import a model, ...
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12 views

Question about model loading and textures

I recently learned how to load models with assimp, but I'm confused about something. Assimp loads normal and height vertices, but you can also load height and normal textures. So far, I've done shader ...
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1answer
35 views

How to use assimp textures with openGL/getting a better understanding

I recently learned how to load a model to openGL using assimp, but I am having trouble figuring out how to do lighting calculations on this model. Previously with my own created objects I would set ...
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1answer
78 views

ASSIMP Skinning seems to be somewhat inverted

I'm currently implementing Skinning using Assimp as my asset importer. I've relied heavily on the following tutorial in order to skin meshes (http://ogldev.atspace.co.uk/www/tutorial38/tutorial38.html)...
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71 views

Exported Blender model is flipped when Imported into game using Assimp

I have made a 3D game engine, and as part of this I use Assimp to load in meshes to my game. One of the meshes I load in is my ...
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35 views

Frustrum culling without per-mesh positions

I am trying to implement frustrum culling in a C++ renderer im writing but I feel like I hit a brick wall. The plan is to load the Sponza level and per mesh create a collision box using Bullet ...
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26 views

Wrong Bone deformations using assimp

Hi I'm trying to animate a skinned mesh in my game using assimp and OpenGL. this question is a follow up of this one : OpenGL Strange mesh when animating Assimp But I'm having diffuculty ...
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1answer
127 views

OpenGL Strange mesh when animating Assimp

I'm trying to animate a skeletal mesh. The mesh loads with no problems and everything is set up correctly. My problem is that when I calculate the matrix for a given keyframe the mesh goes nuts. Here ...
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0answers
185 views

How is root motion done in Skeletal animation

I am using Assimp library to load bone and mesh data and using basic interpolation to accomplish the animation part. Right now I want to move my character position with animation, i.e. root motion. ...
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1answer
74 views

frustum culling and exporting a big scene model

Let's assume that I created in Blender a race track with landscape. I can export it to single wavefront obj file and then load in my graphics engine using assimp but it doesn't allow to use frustum ...
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48 views

Understanding ticksPerSecond and duration with skeletal animations

That's my first question here so i hope to do all correctly. From various weeks i started surfing the net about Skeletal animation aiming to add a simple animation controller into my small game engine....
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1answer
207 views

ASSIMP skeletal animation with some FBX files has issues - weird node added

Hi I'm trying to work load fbx files to my OpenGL Renderer using ASSIMP. However, weird nodes that are not in the original fbx file are added whenever I load the file with the ASSIMP importer. For ...
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1answer
227 views

C++ Assimp - Transformation Hierarchy

I have a question regarding model imports using ASSIMP. I've been working on an Entity and Component (e.g. unity gameobject component) based game engine for fun and to learn in my spare time. I've ...
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0answers
160 views

ASSIMP - Hierarchy Import

I'm, trying to wrap my head around assimp to import some files, including fbx/obj etc. Normally my experience tells me that I start at root node and then recursively load child nodes until I load the ...
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1answer
150 views

Skeletal animation: unexpected quarternion values

I'm following ThinMatrix's skeletal animation tutorial and his custom written Collada parser is deriving a different rotation quaternion from each keyframe matrix than the Assimp importer library does....
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1answer
239 views

OpenGL is not drawing model with more than one material

I have model created in Blender that have 3 UV Maps, 3 materials and each material has texture. Below you can see it. Also I have OpenGL application that draw this model. Application is working ...
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1answer
542 views

Exporting a simple mesh from Blender for reading in Assimp

I'm trying to create some simple assets for using in my rendering engine. What I'm trying to do is to generate simple low poly models and then importing them into my application using Assimp. I can ...
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0answers
528 views

ASSIMP aiNode->mMeshes understanding

I'm trying to use ASSIMP to load an fbx file with a skeleton and animations, but I'm stuck on something I'm misunderstanding and struggling to see it. I've attached 2 images, one of the fbx file as ...
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1answer
288 views

ASSIMP library imports wrong number of bones from COLLADA file

I have a COLLADA(.dae) file exported from Blender, also I have program that read all data from structure generated with Assimp and I want to translate all data in more readable format. Problem appears ...
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1answer
543 views

Program compiled with assimp will not start

I have recently updated my game engine source code to use the visual studio(2017) vc141 toolkit. I am using Assimp 3.1.1 for model loading. The project compiles and links, and the appropriate dll's ...
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1answer
259 views

C++ - Assimp - OpenGL vertex data feed problem

I'm getting a very weird problem where OpenGL doesn't use the hardware to render anything, so I get just a cleared blank screen. Here's some code: ...
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0answers
79 views

Skeletal Animation: No initial bone rotation

I am currently trying to implement animations in my game. I am having an issue where the bones do not rotate properly. In my program, I apply an inverse bind pose to each bone to move them to bone ...
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1answer
196 views

Errors attempting to use Assimp in DirectX 12

I am trying to load a 3D model within a DirectX 12 project by means of Assimp, but even when I write only the importer function, I get errors I can not fix. How do I fix this? Here is my code: ...
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1answer
802 views

Incomplete rendering using OpenTK (VBO)

Using Assimp.net I did load obj file. assimp returns back Mesh object that contains vertexes, normals, faces, colors and texture. when I don't use VBO the object will load complete. like this : But ...
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1answer
456 views

C++ Assimp - Models incorretly drawn/loaded

I've followed a tutorial about using Assimp to load models, but the loaded models are incorrectly drawn: These should be a spheres I've checked my code multiple times but I can't seem to find what I ...
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1answer
483 views

Models loaded with Assimp have messed up UVs/normals

I've been trying to use Assimp to load models and so far I got it to load a few obj models, but all of them have messed up UVs (and maybe normals). Here's what it looks like : I tried several ...
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1answer
146 views

Best format for model with double UV sets [closed]

I'd like to use first UV set as wrapping (or when some faces cover another on UV) diffuse color map and second UV set as baked ambient occlusion (packed to islands) ...
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2answers
850 views

FBX animation works in 3DSMax but not with Assimp [closed]

I have an FBX file that represent a plane with an animation of the gear opening. In my editor 3DSMax or in the Unity editor, the file and animation seem good, but when I use Open 3D Model(the official ...
2
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1answer
565 views

Loading non-skeletal animation to opengl via assimp

I'm a newbie in assimp and openGL. I'm trying to import .fbx or .dae formatted file to openGL via assimp. Importing skeletal animation was kind of easy. Lots of introductions and sample projects ...
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0answers
729 views

trouble getting correct transforms for multiple meshes from assimp importer

I have had excellent success in extracting almost everything i need from a collada file that i imported with assimp, however I am struggling to get the correct transforms for each mesh in the file. ...
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0answers
477 views

AssImp Skeletal Animation Issues [closed]

Tried creating an animated mesh but I render it, it comes up as a flat mesh that moves with the camera. Followed the OGL Animation tutorial here (http://www.ogldev.org/www/tutorial38/tutorial38.html). ...
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0answers
157 views

Skin Mesh Animation Shader Issue

I'm having troubles with properly animating a skin mesh from an .fbx file. I feel like the issue is in the shader, but not sure what is going on. All I know is that I am getting unexpected results ...
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2answers
1k views

ASSIMP OpenGL collada and Skeletal Animation

first of all i would like to say that i read everything out there and still did not figure it out quite yet. In my project i need to implement a skinning technique, but before going there i need to ...
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0answers
148 views

Updating aiScene in ASSIMP with skeleton data

I am working on a project where I take an unrigged closed mesh, import it using ASSIMP, auto-rig it using the algorithm provided by Ilya Baran and Jovan Popovic and again export it using ASSIMP. I ...
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1answer
636 views

Mesh's triangles don't move properly during skeletal animation

I've been trying to implement skeletal animation in my engine using this tutorial, and I've been having problems. Using the model they provided, I get results like this: But on some other models, ...
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1answer
39 views

m_Entries is undefined [closed]

I am following this tutorial and this guy puts in his code m_Entries and doesn't explain it at all at least I think. So any one who has done skeletal animation show me what he is talking about by ...
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1answer
115 views

m_BoneMapping is undefined in OpenGL Step By Step Skeletal Animation Tutorial [closed]

I am new to this website I was following this specific tutorial on skeletal animation and I have a good idea on what it is, but when I was following his implementation he used a variable called "...
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2answers
1k views

Data structure for multiple Textures in materials in assimp

I'm going through assimp documentation regarding materials. Each material can have multiple textures containing various data (color maps, height maps, etc.) and blending data, etc. I'm trying to ...
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0answers
566 views

How to link assimp lib to universal app

I cannot make assimp object loader work with universal app, and I got the same problem as this one: Assimp and directX12 universal apps I tried the static library approach mentioned in the answer of ...
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1answer
712 views

Assimp Texture Coords problem

I've got a problem when loading objects using assimp. I did succesfully load vertex data and I am able to draw static mesh (without bones and animations, I've got few bugs there but I'll go back to ...
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1answer
953 views

Assimp, Blender and model rotating

There is something I can't figure out. I have two models - grass.blend and tower.blend. grass.blend: tower.blend: Note X, Y and Z axises. The problem is that when I load these models using Assimp ...
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2answers
3k views

ASSIMP transformation hierarchy and animations

I don't fully understand the transformation hierarchy used by ASSIMP. According to the docs (http://assimp.sourceforge.net/lib_html/structai_node.html) an aiNode's transformation is relative to its ...
3
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1answer
641 views

Assimp and directX12 universal apps

I started a directX 12 universal app project on visual studios and started coding some stuff to create a physics engine. I was currently working on implmenting Assimp into the engine too load whatever ...
6
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1answer
333 views

Set the name of an animation in collada to be used by AssImp

I am using the collada file format to contain my model and animation but when I use AssImp to load the file the name will be empty for the animation. Where is the name for animation set on the collada ...
5
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1answer
3k views

Skeletal animation in OpenGL

I'm using Assimp to do skeletal animation in my OpenGL application. I used Blender to export this one-boned model to a COLLADA file: The model has only one bone, called arm bone, that controls the ...
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1answer
994 views

change position/orientation of a bone using assimp

I have been using assimp to import rigged models and animations. I followed this tutorial for skeletal animation and I have got it done properly. The part that I am trying to do now is to orient a ...
3
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1answer
4k views

Skeletal animation with ASSIMP, COLLADA, and glm

I have been trying to learn how to implement skeletal animation (skinning) from COLLADA files using ASSIMP and glm. But after a week of being stuck reading different tutorials and posts I have found ...
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2answers
5k views

How do I build Assimp with MinGW?

How can I build Assimp with cMake and MinGW? I tried, but I don't get a functioning library... Details of my attempt: I am trying to build the Open Asset Import Library (Assimp) but I have been ...