OpenGL（GLSL）中使用Assimp进行骨骼动画

Question

我正在尝试在程序中实现GLSL-powered骨骼动画...但是我创造出了一个怪物，而不是美丽的3D动画：https://i.imgur.com/dmpKg6n.gif 经过尝试了几种不同的技术，我创建了一个稍微不那么可怕但仍然是个怪物的东西: 这个模型是一个穿着衣服的基本人形，动画应该是腿在摆动，其余部分保持静止（非常简单的测试动画）。所有骨骼都有在t=0时的静态关键帧，以尽量减少它们每几秒跳出原位的可能性。

问题...应该是相当明显的。另外，我相当确定模型比它应该的高。

不管怎样，这是我的原始顶点着色器：

#version 430 core
layout (location = 0) in vec4 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texcoords;
layout (location = 3) in vec4 color;
layout (location = 4) in vec4 Weights;
layout (location = 5) in vec4 BoneID;
layout (location = 0) out vec4 f_position;
layout (location = 1) out vec3 f_normal;
layout (location = 2) out vec2 f_texcoord;
const int MAX_BONES = 50;
layout (location = 1) uniform mat4 proj_matrix;
layout (location = 2) uniform mat4 mv_matrix;
layout (location = 6) uniform mat4 boneTrans[MAX_BONES];
void main(void)
{
mat4 boneTransform = (boneTrans[int(BoneID[0])] * Weights[0]) +
(boneTrans[int(BoneID[1])] * Weights[1]) +
(boneTrans[int(BoneID[2])] * Weights[2]) +
(boneTrans[int(BoneID[3])] * Weights[3]);
float rem = 1 - (Weights[0] + Weights[1] + Weights[2] + Weights[3]);
boneTransform += mat4(1.0) * rem;
f_texcoord = texcoords;
f_position = mv_matrix * (boneTransform * position);
mat4 mv_mat_simple = mv_matrix;
mv_mat_simple[3][0] = 0.0;
mv_mat_simple[3][1] = 0.0;
mv_mat_simple[3][2] = 0.0;
vec4 norm1 = boneTransform * vec4(normal, 1.0);
vec4 nnormal = mv_mat_simple * vec4(norm1.xyz, 1.0);
f_normal = nnormal.xyz / nnormal.w; // TODO: Normalize?
vec4 pos1 = boneTransform * position;
gl_Position = proj_matrix * mv_matrix * vec4(pos1.xyz, 1.0);
}

这是我的新内容：

#version 430 core

layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texcoords;
layout (location = 3) in vec4 color;
layout (location = 4) in vec4 Weights;
layout (location = 5) in vec4 BoneID;

layout (location = 0) out vec4 f_position;
layout (location = 1) out vec3 f_normal;
layout (location = 2) out vec2 f_texcoord;

const int MAX_BONES = 50;

layout (location = 1) uniform mat4 proj_matrix;
layout (location = 2) uniform mat4 mv_matrix;
layout (location = 6) uniform mat4 boneTrans[MAX_BONES];

void main(void)
{
    vec4 pos1 = vec4(position, 1.0);
    pos1 += (boneTrans[int(BoneID[0])] * vec4(position, 0.0)) * Weights[0];
    pos1 += (boneTrans[int(BoneID[1])] * vec4(position, 0.0)) * Weights[1];
    pos1 += (boneTrans[int(BoneID[2])] * vec4(position, 0.0)) * Weights[2];
    pos1 += (boneTrans[int(BoneID[3])] * vec4(position, 0.0)) * Weights[3];
    vec4 norm1 = vec4(normal, 1.0);
    norm1 += (boneTrans[int(BoneID[0])] * vec4(normal, 0.0)) * Weights[0];
    norm1 += (boneTrans[int(BoneID[1])] * vec4(normal, 0.0)) * Weights[1];
    norm1 += (boneTrans[int(BoneID[2])] * vec4(normal, 0.0)) * Weights[2];
    norm1 += (boneTrans[int(BoneID[3])] * vec4(normal, 0.0)) * Weights[3];
    f_texcoord = texcoords;
    f_position = mv_matrix * vec4(pos1.xyz, 1.0);
    mat4 mv_mat_simple = mv_matrix;
    mv_mat_simple[3][0] = 0.0;
    mv_mat_simple[3][1] = 0.0;
    mv_mat_simple[3][2] = 0.0;
    //vec4 norm1 = boneTransform * vec4(normal, 1.0);
    vec4 nnormal = mv_mat_simple * vec4(norm1.xyz, 1.0);
    f_normal = nnormal.xyz / nnormal.w; // TODO: Normalize?
    gl_Position = proj_matrix * mv_matrix * vec4(pos1.xyz, 1.0);
}

骨骼处理代码既不美观也不简短：http://pastebin.com/A8x1GdUw 该代码和原始着色器来自http://ogldev.atspace.co.uk/www/tutorial38/tutorial38.html 新的着色器是从随机搜索中衍生出来的。

编辑：现在我得到了这个： 使用此代码： http://pastebin.com/PvCWUdJn 现在……我做错了什么？ 处理这个的“正确”方法是什么？ 有没有更高质量的教程可以替代这个？

更新：用于测试应用程序的完整源代码：https://github.com/mcmonkey4eva/skeletalanimationtest

- mcmonkey4eva

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请确保N64卡带始终完全插好。 - genpfault

我已经添加了一个完整的测试应用程序的源代码，以证明这个问题：https://github.com/mcmonkey4eva/skeletalanimationtest - mcmonkey4eva

Answer 1

因此，答案很简单-不要在着色器中将矩阵乘以向量，而是将向量乘以矩阵。

- mcmonkey4eva