Node access problems in delta3d

When I was a beginner at delta3d, I encountered a problem when I tried to develop it two days ago, that is, I could not find the switch node. As a result, I read the program that was originally written using Vega. The name is correct, and the type is correct. It was a bit confused for a moment. Later, I checked the code after the model is converted to OSG in the stage and found that the node is not changed to OSG: switch, but osgsim :: multiswitch, no matter what happens, the cause of the error is finally known. Continue the analysis.

Someone on delta3d's official website says this problem using dtutil: nodecollector could not find multiswtich. A solution is provided, that is, access using nodevisitor of the previous OSG. I am very lazy. I always feel that OSG is too difficult to write. I always want to find a convenient method. And I will use this method to find the Degree of Freedom node in a short time (ER, I am a cainiao, I only used Vega, I was just a month ago, I was not familiar with graphics, and I still don't know what Transformation Matrix I got) looking for a switch node using another method is not very comfortable. So Google continued to find that someone on SourceForge gave the modified dtutil: nodecollector program supports multiswitch and has been added to version 2.4. This is a good time to come down. Who would think that compilation is not the case? I still can't do it. I'm dizzy. It's not torture me. I can't even steal a lazy one. Analysis Code (open-source power) found that the new nodecollector added a new function in its own nodevisitor

Virtual void apply (osgsim: multiswitch & pmultiswitch)

The problem should be solved here, because nodevisitor does not define this interface.

Trace the source and check the node: accept function.

Void node: accept (nodevisitor & NV) <br/>{< br/> If (NV. validnodemask (* This) <br/>{< br/> NV. pushontonodepath (this); <br/> NV. apply (* This); <br/> NV. popfromnodepath (); <br/>}< br/>}

Because the apply overload function with the multiswitch parameter is not defined in nodevistor, NV here. apply Is the function corresponding to OSG: group called. Therefore, multiple nodes are naturally added to the group. Therefore, according to this modification program

Dtcore: refptr <OSG: group> mmultiswitch; <br/> dtcore: refptr <dtutil: nodecollector> mosgcollector = new dtutil: nodecollector (getgameactorproxy (). getgameactor (). getosgnode (), dtutil: nodecollector: groupflag | dtutil: nodecollector: doftransformflag); <br/> mmultiswitch = mosgcollector-> getgroup ("SW1 "); <br/> osgsim: multiswitch * mMulti = dynamic_cast <osgsim: multiswitch *> (mmultiswitch. get (); <br/> mMulti-> setsinglechildon (0, true); <br/>

 

Run successfully

The bare pointer code is used here, which is not very standard and has potential security risks. Please note that

 

I modified the nodecollector source code and made a dynamic type judgment in virtual void apply (OSG: Group & group ).

However, the result is no effect. Therefore, it is assumed that OSG should process osgsim: in the case of multiswitch, it should be processed as a group directly.

 

After talking about it for half a day, you just need to make a type conversion. It only means that you are too busy to figure out the overall operation of OSG. You can check it carefully before finding it.

 

Finally, because I am a newbie, I do not have in-depth understanding of delta3d and OSG, so it is inevitable that there will be some errors.

Please give me more advice and hope to have a chance to communicate with you.

It seems that it's quite late. I have to play the game tomorrow morning to clean up and sleep.