unreal flume
I'm working on skeletal animations, and am completely lost as to where this is falling apart. The bone transform matrices look ok, but the image is completely warped.
(the model loading on it's own works fine, it's just the animation that is broken)
Does anyone know what could be causing this type of distortion based on the image?
Here is the vertex shader (in MSL)
v2f vertex vertex_main(device const packed_float3* pos_data [[buffer(0)]],
device const packed_float2* uv_data [[buffer(1)]],
device const packed_float3* normal_data [[buffer(2)]],
device const Camera_Data& camera_data [[buffer(3)]],
device const int4* bone_id [[buffer(6)]],
device const packed_float4* bone_weight [[buffer(7)]],
device const float4x4* bone_transforms [[buffer(8)]],
uint vertex_id [[vertex_id]]) {
v2f o;
float3 pos = pos_data[vertex_id];
float4 norm = float4(normal_data[vertex_id], 0);
float4 total_position = float4(0, 0, 0, 0);
float4 total_normal = float4(0, 0, 0, 0);
int4 bone_ids = bone_id[vertex_id];
float4 bone_weights = bone_weight[vertex_id];
if (all(bone_ids == int4(-1))) {
total_position = float4(pos, 1);
total_normal = norm;
} else {
for (int i = 0; i < 4; i++) {
if (bone_ids[i] == -1) {
continue;
}
if (bone_ids[i] >= 100) {
break;
}
float4 local_pos = bone_transforms[bone_ids[i]] * float4(pos, 1);
total_position += local_pos * bone_weights[i];
total_normal += bone_transforms[bone_ids[i]] * bone_weights[i] * norm;
}
}
o.position = camera_data.perspective_transform * camera_data.view_transform * camera_data.world_transform * total_position;
}
unreal flume
Turns out MSL uses 32 bit integers. I was passing the bone ids as an int instead of an i32.
That was a painful one...