<div dir="ltr">here is my file (it's only handling 1 axis)<div><br></div><div><a href="http://www.pasteall.org/blend/30589">http://www.pasteall.org/blend/30589</a><br></div><div><br></div><div>it's a little tricky, but it gives the effect of slow parent,</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jul 22, 2014 at 4:00 PM, brita <span dir="ltr"><<a href="mailto:britalmeida@gmail.com" target="_blank">britalmeida@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Ortiz, i meant to thank you for the example you provided, and asked to see Jacob's logic brick setup.<div>
<br></div><div>Clearing the response for clarity on what I still need feedback:</div><div><br></div>
<div>3) Parenting types<br></div><div class=""><div><span style="font-family:arial,sans-serif;font-size:13px">When I parent to a vertex, does it mean I am only parenting to the position? As a user I am not choosing the specific vertex..</span><br>
</div></div><div><div><span style="font-family:arial,sans-serif;font-size:13px">3 Vertices/Triangle </span><span style="font-family:arial,sans-serif;font-size:13px"> </span><span style="font-family:arial,sans-serif;font-size:13px">- at the moment this is doing exactly the same as a normal parent relation</span><br>
</div><div></div></div><div class=""><div><div style="font-family:arial,sans-serif;font-size:13px"><font face="arial, sans-serif">Shouldn't vertex (and triangle) have the relative/offset/inverse option too?</font></div>
</div><div style="font-family:arial,sans-serif;font-size:13px">
<font face="arial, sans-serif"><br></font></div></div><div style="font-family:arial,sans-serif;font-size:13px"><font face="arial, sans-serif">4) Slowparents</font></div><div><font face="arial, sans-serif"><div>
I think it makes more sense to have an object parented to another according to whether it makes sense or not for the object to be in the other's transform space (following it's scale, orientation..). I think of this as a 'tight' connection, as if the child totally belongs to / is part off the parent. If the child is instead meant to track another object, it should not be it's child, it should follow it according to some function/logic.</div>
<div><br></div><div><div>Slow parenting is currently calculated in the scene graph as a slerp.</div><div>I think this would be better implemented with a 'constraint' controller, allowing:</div><div>- a better user interface: the current one is quite hidden and not very flexible</div>
<div>- more constraint types and tweaking</div><div>- more flexibility in the code as well by having this out of the scene graph and instead on a step meant to update an object's location relative to others.</div><div>
- more accuracy - currently, the slerp is not using a time delta and may be run several times per frame according to scene graph needs</div><div><br></div><div>What I am proposing here is 1) move slow parent out of the scene graph 2) implement a new controller that reproduces this functionality and more</div>
<div>Does this make sense? Is it a good idea? Does it have enough priority?</div><div><br></div><div><br></div><div><div style="font-size:13px">5) what are those 'depsgraph hacks' checkboxes at object properties panel > Relations Extras ?<div class="">
<br>
>Ton added these as a way of telling to depsgraph to tag objects or their object-data block to get calculated one more time. It's a quick hack aimed at providing an optional way to fix a very limited number of pseudo-cyclic scenarios. Does it work? Only in a very limited number of cases, but</div>
</div><div class="">
<div style="font-size:13px">hopefully enough to tide us over until the real problem gets solved...<br></div></div><div style="font-size:13px">-> Can you give me a concrete example? should I check if the GE scenegraph is also respecting this checkboxes or it doesn't apply?<div class="">
<br>
<br><br>6) method consistency on SG_Spatial.cpp</div></div><div class=""><div style="font-size:13px">There is a SetLocal and SetWorld for Position, Orientation and Scale. So far so good.</div><div style="font-size:13px">
Then there is a Relative Translate Rotate and Scale:</div>
<div style="font-size:13px">6.1) I don't really get the point of these functions and they're all different, Can someone clarify?</div><div style="font-size:13px">6.2) Translate optionally considers the parent, the Rotate and Scale do not.</div>
<div style="font-size:13px">6.3) RelativeScale does not have a 'local' flag. Of course that applying a scale in local or world coordinates would be the same, but scaling to a value would not. Such as scale = 2 instead of scale * 2</div>
<div style="font-size:13px"><br></div></div><div style="font-size:13px">The relative translate is used on the Object/Motion Actuator and the Steering Actuator with local as false.</div><div style="font-size:13px">The relative location is used in the Object/Motion Actuator and the MouseActuator</div>
<div style="font-size:13px">Both are hooked in the python API:</div><div style="font-size:13px"><a href="http://www.blender.org/documentation/blender_python_api_2_71_release/bge.types.KX_GameObject.html?highlight=applymovement#bge.types.KX_GameObject.applyMovement" style="font-size:small" target="_blank">http://www.blender.org/documentation/blender_python_api_2_71_release/bge.types.KX_GameObject.html?highlight=applymovement#bge.types.KX_GameObject.applyMovement</a><br>
</div></div><div>According to the python API docs, 'not local' should be world space, not parent space.<br></div></div><div>The relativeTranslate is using the parent if existing, also, the caller ensures that the physics also applies the same transform using world space and never the parent: </div>
<div>
<p style="margin:0px"><a href="https://developer.blender.org/diffusion/B/browse/soc-2014-bge/source/gameengine/Ketsji/KX_GameObject.cpp$594" target="_blank">https://developer.blender.org/diffusion/B/browse/soc-2014-bge/source/gameengine/Ketsji/KX_GameObject.cpp$594</a></p>
<p style="margin:0px">Should I change this? It can have an impact in previously made games using the logic bricks or python.</p></div><div><br></div><div><div style="font-size:13px">The relative scaling is not used by logic bricks and does not have a python hook. Is it only directly connected in places where I think it can be removed.</div>
</div><div style="font-size:13px"><br></div><div style="font-size:13px">---</div><div style="font-size:13px">Inês Almeida</div></font></div></div>
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