john_connor

10-04-2017, 04:02 AM

hi,

i'm having problem to correctly animate separate nodes of a model. the nodes are hierarchically structured, and each node has a "mat4 Transform" (relative to its parent). to animate nodes, each nodes has an additional member "mat4 Animation" (relative to the base transform "mat4 Transform").

to get the final "mat4 world_transform":

mat4 Node::WorldTransform() const

{

return

m_parent ?

inverse(inverse(Animation) * inverse(Transform) * inverse(m_parent->WorldTransform())) :

Transform * Animation;

}

that works fine, but the "assimp" library i use to load models delivers the "mat4 Animation" as absolute transform relative to the node's parent.

in other words:

--> assimp gives me [Transform * Animation] and [Transform]

--> i want [Animation] only (separated)

how do i do that ??

http://assimp.sourceforge.net/lib_html/structai_node.html

http://assimp.sourceforge.net/lib_html/structai_node_anim.html

beside that:

is it better to pre-calculate all the possible animation matrices for each "key frame tick" or just do the calculations "on-the-fly" ?

i'm having problem to correctly animate separate nodes of a model. the nodes are hierarchically structured, and each node has a "mat4 Transform" (relative to its parent). to animate nodes, each nodes has an additional member "mat4 Animation" (relative to the base transform "mat4 Transform").

to get the final "mat4 world_transform":

mat4 Node::WorldTransform() const

{

return

m_parent ?

inverse(inverse(Animation) * inverse(Transform) * inverse(m_parent->WorldTransform())) :

Transform * Animation;

}

that works fine, but the "assimp" library i use to load models delivers the "mat4 Animation" as absolute transform relative to the node's parent.

in other words:

--> assimp gives me [Transform * Animation] and [Transform]

--> i want [Animation] only (separated)

how do i do that ??

http://assimp.sourceforge.net/lib_html/structai_node.html

http://assimp.sourceforge.net/lib_html/structai_node_anim.html

beside that:

is it better to pre-calculate all the possible animation matrices for each "key frame tick" or just do the calculations "on-the-fly" ?